What is how to block a youtube channel?

You can't actually "block" a YouTube channel in the sense of preventing them from uploading or participating on the platform. However, you can block a YouTube channel from interacting with you directly, and prevent yourself from seeing their content. Here's how:

• Blocking a user from commenting: You can block a user from commenting on your videos or channel. Go to their channel page and select the "About" tab. Click the "Flag" icon and select "Block User". This will prevent them from commenting on your channel. More info here: Blocking a User.

• Hiding a channel from your recommendations: Click on the three dots next to a video from the channel on your homepage or in your search results. Then, select "Don't recommend channel." This will reduce the likelihood of seeing content from that channel in your recommendations. Additional instructions on this process are available here: Hiding a Channel.

• Using a browser extension: Several browser extensions can block entire channels from appearing on YouTube. Search for these in your browser's extension store (e.g., Chrome Web Store). Some popular extensions are available and information on their use can be found here: Browser Extensions.

Keep in mind that these methods don't completely erase the channel from YouTube; you just won't see their content unless you specifically search for it.