Update beta-testing.md

docs/miscellaneous/contribute/beta-testing.md

@@ -1,18 +1,30 @@
 ---
-title: AdGuard beta testing
+title: AdGuard beta/nightly testing
 sidebar_position: 1
 ---
 
-There is an AdGuard app for virtually every major platform out there, and we regularly release updates for all of them. This would not be possible without beta testing and, more importantly, beta testers. Want to become one? Here's how you can do it.
+There is an AdGuard app for virtually every major platform out there, and we regularly release updates for all of them. This would not be possible without beta and nightly testing and, more importantly, without our testers. Want to become one of them? Here's how you can do it.
 
-## How to become a beta tester {#intro}
+### Beta or nightly: what is the difference?
 
-Our requirements are easy: use AdGuard, upgrade to the beta version when it becomes available, and report any bugs you notice. However, you will need a [GitHub](https://github.com/) account to become our beta tester, so you may want to get that out of the way first.
+Both beta and nightly testing are important to make AdGuard constantly better. However, they are different, and you can choose the one that suits you more.
+
+The development process follows a progression from nightly to beta and then from beta to the final, stable version. It means that you are more likely to find bugs in the nightly builds, but you get access to new features faster, almost on a daily basis. On the other hand, the beta is more stable, but you will get updates less often.
+
+## How to become a beta or nightly tester {#intro}
+
+Our requirements are easy: use AdGuard, upgrade to the beta/nightly version when it becomes available, and report any bugs you notice. You will need a [GitHub](https://github.com/) account to become our tester, so you may want to get that out of the way first.
 
 In any case, every single thing you need to know is gathered on a [dedicated page](https://adguard.com/beta.html).
 
 If you want to skip the description part and get straight to the action, you can apply [here](https://surveys.adguard.com/beta_testing_program/form.html). Your application will be reviewed within 1-3 working days, and you'll get a reply via email.
 
+:::note
+
+To get the AdGuard for iOS beta or nightly build, first you have to install [Testflight](https://apps.apple.com/app/testflight/id899247664) on your iOS device.
+
+:::
+
 ## How to report a bug {#report-a-bug}
 
 If you spotted a bug or just want to share your suggestion, let us know: go to [GitHub](https://github.com/AdguardTeam/), find a suitable repository, create a new issue there, and describe the bug/feature request in detail.
@@ -23,7 +35,7 @@ The above method is the most preferred, but you can use others if necessary:
 
 - Email our support team from the Support tab in the app or write directly to [[email protected]](mailto:[email protected]).
 
-## How to activate the beta key in the iOS application {#ios}
+## How to activate a beta/nightly key in the iOS application {#ios}
 
 If you have already received a beta key and it is listed in your `adguard.com` account, go to the app and open the license section (Get Premium). Once there, enter the credentials from your AdGuard account. After that, the premium features will become available automatically.