There are many ways in which the Stack Exchange system rate-limits its users.
This question is to provide a canonical place for all the rate limits, and any special details to be listed, so it can be referred to in posts.

I hope others with more knowledge will edit and correct/update the details.

I noticed that I can only perform certain actions such as commenting a finite number of times in a given period of time. Obviously, rate limiting is in place to prevent accidental misuse or intentional abuse of certain features.

Where else is rate limiting applied on Stack Exchange sites, and what are the limits?

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There are many ways in which the Stack Exchange system rate-limits its users.
This question is to provide a canonical place for all the rate limits, and any special details to be listed, so it can be referred to in posts.

I'll provide an answer (mostly a stub for now), and expect others with more knowledge and time to edit and correct/update the details (though I will also be polishing this up and adding links in the future). Any mod feel free to make this post Community Wiki (and then edit out this text).

There are many ways in which the Stack Exchange system rate-limits its users.
This question is to provide a canonical place for all the rate limits, and any special details to be listed, so it can be referred to in posts.

I hope others with more knowledge will edit and correct/update the details.