docs: troubleshooting guilde (#1065)

Author: mdjastrzebski

README.md

@@ -143,7 +143,7 @@ The [public API](https://callstack.github.io/react-native-testing-library/docs/a
 
 ## Troubleshooting
 
-- [Understanding `act` function](https://callstack.github.io/react-native-testing-library/docs/understanding-act)
+- [Troubleshooting guide](https://callstack.github.io/react-native-testing-library/docs/troubleshooting)
 
 ## Related External Resources
 

website/docs/Troubleshooting.md

@@ -0,0 +1,41 @@
+---
+id: troubleshooting
+title: Troubleshooting
+---
+
+This guide describes common issues found by users when integrating React Native Test Library to their projects.
+
+## Matching React Native, React & React Test Renderer versions
+
+Check that you have matching versions of core dependencies:
+- React Native
+- React
+- React Test Renderer
+
+React Native uses different versioning scheme from React, you can use [React Native Upgrade Helper](https://react-native-community.github.io/upgrade-helper/) to find the correct matching between React Native & React versions. In case you use Expo, you should use dependency versions recommended by them and set by `expo upgrade` command.
+
+React Test Renderer usually has same major & minor version as React, as they are closely related and React Test Renderer is part of [React monorepo](https://github.com/facebook/react).
+
+Related issues:
+- [#1061](https://github.com/callstack/react-native-testing-library/issues/1061)
+- [#938](https://github.com/callstack/react-native-testing-library/issues/938)
+- [#920](https://github.com/callstack/react-native-testing-library/issues/920)
+
+## Example repository
+
+We maintain an [example repository](https://github.com/callstack/react-native-testing-library/tree/main/examples/basic) that showcases a modern React Native Testing Library setup with TypeScript, Jest Native, etc.
+
+In case something does not work in your setup you can refer to this repository for recommended configuration.
+
+## Act warnings
+
+When writing tests you may encounter warnings connected with `act()` function. There are two kinds of these warnings:
+
+* sync `act()` warning - `Warning: An update to Component inside a test was not wrapped in act(...)`
+* async `act()` warning - `Warning: You called act(async () => ...) without await`
+
+You can read more about `act()` function in our [understanding `act` function guide](https://callstack.github.io/react-native-testing-library/docs/understanding-act).
+
+Normally, you should not encounter sync `act()` warnings, but if that happens this probably indicate an issue with your test and should be investigated.
+
+In case of async `act()` function this might happen more or less randomly, especially if your components contain async logic. So far this warning does not seem to affect test correctness.

website/sidebars.js

@@ -9,6 +9,7 @@ module.exports = {
       'migration-v2',
       'how-should-i-query',
       'faq',
+      'troubleshooting',
       'eslint-plugin-testing-library',
       'understanding-act',
     ],