See the process of trap-neuter-return
No matter how much you might read, TNR always seems like it happens on another planet!
Neighborhood Cats put together an excellent 30-minute video called How to Perform a Mass Trapping. It’s a little slow at some points, but it steps you through every single piece of the TNR process.
Oh the opposite end of things, there’s a random video on YouTube that’s always really stuck with me. It shows you just how scared cats can be when they first get caught into a trap, and how drop traps/transferring out of drop traps works. It’s definitely not a perfect example of how to trap a cat or treat a cat that’s in a trap, but it’s a pretty solid example of a not-great scenario if you’re never trapped before and forget your trap sheet or something.