How Telegram Bots Can Be Useful in Channels ​

Bots can participate in channels only as admins. Admin rights allow bots sending and editing posts, renaming channels, and so on.

Admin rights ​

Just like in groups, channel admins can select bot admin rights where the default options can be configured in BotFather.

Adding buttons to posts ​

The most common use case for bots in channels is adding buttons: likes, links, and other.

This works with use of the "Edit messages of others" admin right: a bot may add buttons when editing messages.

Like this: