diff --git a/UPGRADE.md b/UPGRADE.md
index 21cdff83f10..454d0468bb0 100644
--- a/UPGRADE.md
+++ b/UPGRADE.md
@@ -34,7 +34,7 @@ Failing to upgrade one of the `ra-` packages will result in a duplication of the
 
 * `react` and `react-dom` are now required to be >= 16.9. This version is backward compatible with 16.3, which was the minimum requirement in react-admin, and it offers the support for Hooks, on which react-admin v3 relies heavily.
 * `react-redux` requires a minimum version of 7.1.0 (instead of 5.0). Check their upgrade guide for [6.0](https://github.com/reduxjs/react-redux/releases/tag/v6.0.0) and [7.0](https://github.com/reduxjs/react-redux/releases/tag/v7.0.0)
-* `redux-saga` requires a minimim version of 1.0.0 (instead of ~0.16.0). Check their [list of breaking changes for redux-saga 1.0](https://github.com/redux-saga/redux-saga/releases/tag/v1.0.0) on GitHub. 
+* `redux-saga` requires a minimum version of 1.0.0 (instead of ~0.16.0). Check their [list of breaking changes for redux-saga 1.0](https://github.com/redux-saga/redux-saga/releases/tag/v1.0.0) on GitHub. 
 * `material-ui` requires a minimum of 4.0.0 (instead of 1.5). Check their [Upgrade guide](https://next.material-ui.com/guides/migration-v3/).
 
 ## `react-router-redux` replaced by `connected-react-router`
@@ -1118,17 +1118,17 @@ We've described how to pre-fill some fields in the create form in an [Advanced T
 
 ```jsx
 const AddNewCommentButton = ({ record }) => (
-  <Button
-    component={Link}
-    to={{
-      pathname: "/comments/create",
--     search: `?post_id=${record.id}`,
-+     search: `?source=${JSON.stringify({ post_id: record.id })}`,
-    }}
-    label="Add a comment"
-  >
-    <ChatBubbleIcon />
-  </Button>
+    <Button
+        component={Link}
+        to={{
+            pathname: "/comments/create",
+-           search: `?post_id=${record.id}`,
++           search: `?source=${JSON.stringify({ post_id: record.id })}`,
+        }}
+        label="Add a comment"
+    >
+        <ChatBubbleIcon />
+    </Button>
 );
 ```
 
diff --git a/docs/Authentication.md b/docs/Authentication.md
index a7c8d3b5145..af92d28116e 100644
--- a/docs/Authentication.md
+++ b/docs/Authentication.md
@@ -52,7 +52,7 @@ You can get more details about input params, response and error formats in the [
 
 ## Available Providers
 
-It's very common that your auth logic is so specific that so you'll need to write your own `authProvider`. However, the community has built a few open-source Auth Providers that may fit your need:
+It's very common that your auth logic is so specific that you'll need to write your own `authProvider`. However, the community has built a few open-source Auth Providers that may fit your need:
 
 - **[AWS Amplify](https://docs.amplify.aws)**: [MrHertal/react-admin-amplify](https://github.com/MrHertal/react-admin-amplify)
 - **[AWS Cognito](https://docs.aws.amazon.com/cognito/latest/developerguide/setting-up-the-javascript-sdk.html)**: [thedistance/ra-cognito](https://github.com/thedistance/ra-cognito)
diff --git a/docs/CreateEdit.md b/docs/CreateEdit.md
index c4508508cfc..89893f60260 100644
--- a/docs/CreateEdit.md
+++ b/docs/CreateEdit.md
@@ -577,7 +577,7 @@ const PostList = props => (
 
 **Note**: `<CloneButton>` is designed to be used in a `<Datagrid>` and in an edit view `<Actions>` component, not inside the form `<Toolbar>`. The `Toolbar` is basically for submitting the form, not for going to another resource.
 
-Alternately, users need to prepopulate a record based on a *related* record. For instance, to create a comment related to an exising post. 
+Alternately, users need to prepopulate a record based on a *related* record. For instance, to create a comment related to an existing post. 
 
 By default, the `<Create>` view starts with an empty `record`. However, if the `location` object (injected by [react-router-dom](https://reacttraining.com/react-router/web/api/location)) contains a `record` in its `state`, the `<Create>` view uses that `record` instead of the empty object. That's how the `<CloneButton>` works under the hood.
 
diff --git a/docs/Inputs.md b/docs/Inputs.md
index ac4e8afb4db..aa2f68f4203 100644
--- a/docs/Inputs.md
+++ b/docs/Inputs.md
@@ -1499,7 +1499,7 @@ You can tweak how this component fetches the possible values using the `perPage`
 ```
 {% endraw %}
 
-In addition to the `ReferenceArrayInputContext`, `<ReferenceArrayInput>` also sets up a `ListContext` providing access to the records from the reference resource in a similar fashion to that of the `<List>` component. This `ListContext` value is accessible with the [`useListContext`](/List.md#uselistcontext) hook.
+In addition to the `ReferenceArrayInputContext`, `<ReferenceArrayInput>` also sets up a `ListContext` providing access to the records from the reference resource in a similar fashion to that of the `<List>` component. This `ListContext` value is accessible with the [`useListContext`](./List.md#uselistcontext) hook.
 
 `<ReferenceArrayInput>` also accepts the [common input props](./Inputs.md#common-input-props).
 
@@ -1507,7 +1507,7 @@ In addition to the `ReferenceArrayInputContext`, `<ReferenceArrayInput>` also se
 
 The [`<ReferenceArrayInput>`](#referencearrayinput) component take care of fetching the data, and put that data in a context called `ReferenceArrayInputContext` so that it’s available for its descendants. This context also stores filters, pagination, sort state, and provides callbacks to update them.
 
-Any component decendent of `<ReferenceArryInput>` can grab information from the `ReferenceArrayInputContext` using the `useReferenceArrayInputContext` hook. Here is what it returns:
+Any component descendant of `<ReferenceArryInput>` can grab information from the `ReferenceArrayInputContext` using the `useReferenceArrayInputContext` hook. Here is what it returns:
 
 ```js
 const {
diff --git a/docs/Translation.md b/docs/Translation.md
index 886ed648dff..3b88204b91f 100644
--- a/docs/Translation.md
+++ b/docs/Translation.md
@@ -669,8 +669,9 @@ resources: {
         fields: {
             id: 'Id',
             name: 'Bezeichnung',
-        },
-    },
+        }
+    }
+}
 ```
 
 ## Silencing Translation Warnings
diff --git a/packages/ra-core/src/form/useFormGroup.ts b/packages/ra-core/src/form/useFormGroup.ts
index f5a6dbe2005..cb88fee2c99 100644
--- a/packages/ra-core/src/form/useFormGroup.ts
+++ b/packages/ra-core/src/form/useFormGroup.ts
@@ -52,7 +52,7 @@ type FormGroupState = {
  *     );
  * }
  *
- * @param {string] name The form group name
+ * @param {string} name The form group name
  * @returns {FormGroupState} The form group state
  */
 export const useFormGroup = (name: string): FormGroupState => {
@@ -104,7 +104,7 @@ export const useFormGroup = (name: string): FormGroupState => {
 /**
  * Get the state of a form group
  *
- * @param {FieldStates} fieldStates A map of field states from final-form where the key is the field name.
+ * @param {FieldState[]} fieldStates A map of field states from final-form where the key is the field name.
  * @returns {FormGroupState} The state of the group.
  */
 export const getFormGroupState = (
diff --git a/packages/ra-core/src/i18n/useTranslatable.ts b/packages/ra-core/src/i18n/useTranslatable.ts
index 98afbab0b63..a3b51ac61ce 100644
--- a/packages/ra-core/src/i18n/useTranslatable.ts
+++ b/packages/ra-core/src/i18n/useTranslatable.ts
@@ -10,7 +10,7 @@ import useTranslate from './useTranslate';
  *
  * @param options The hook options
  * @param {string} options.defaultLocale The locale of the default selected locale. Defaults to 'en'.
- * @param {strong[]} options.locales An array of the supported locales. Each is an object with a locale and a name property. For example { locale: 'en', name: 'English' }.
+ * @param {string[]} options.locales An array of the supported locales. Each is an object with a locale and a name property. For example { locale: 'en', name: 'English' }.
  *
  * @returns
  * An object with following properties and methods:
diff --git a/packages/ra-data-fakerest/README.md b/packages/ra-data-fakerest/README.md
index deb66fd7a69..5d849201a85 100644
--- a/packages/ra-data-fakerest/README.md
+++ b/packages/ra-data-fakerest/README.md
@@ -59,12 +59,12 @@ Here is an example input:
 ```json
 {
     "posts": [
-        { "id": 0, "title": 'Hello, world!' },
-        { "id": 1, "title": 'FooBar' }
+        { "id": 0, "title": "Hello, world!" },
+        { "id": 1, "title": "FooBar" }
     ],
     "comments": [
-        { "id": 0, "post_id": 0, "author": 'John Doe', "body": 'Sensational!' },
-        { "id": 1, "post_id": 0, "author": 'Jane Doe', "body": 'I agree' }
+        { "id": 0, "post_id": 0, "author": "John Doe", "body": "Sensational!" },
+        { "id": 1, "post_id": 0, "author": "Jane Doe", "body": "I agree" }
     ]
 }
 ```
diff --git a/packages/ra-test/README.md b/packages/ra-test/README.md
index 4d2dee866f2..4b13940ebc2 100644
--- a/packages/ra-test/README.md
+++ b/packages/ra-test/README.md
@@ -88,7 +88,7 @@ it('should send the user to another url', () => {
 
 ### Testing Permissions
 
-As explained on the [Auth Provider chapter](./Authentication.md#authorization), it's possible to manage permissions via the `authProvider` in order to filter page and fields the users can see.
+As explained on the [Auth Provider chapter](https://marmelab.com/react-admin/Authentication.html#authorization), it's possible to manage permissions via the `authProvider` in order to filter page and fields the users can see.
 
 In order to avoid regressions and make the design explicit to your co-workers, it's better to unit test which fields are supposed to be displayed or hidden for each permission.