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It kind of depends on which manufacturer you go with, each esp kind of has its own quirks and features. Some pins you can only use in high/low mode to avoid turning on some other feature or changing boot functions. Some of the olderboards pins have very specific usecases.

So I'm not sure where to point you honestly. I would start with the official documentation that the manufacturers provide you.

I also think you mistake me for someone that knows what I am doing. I want to express how simple esp home is. You can just download or use the temples in esp home builder and its literally just filling out text boxes. I'm not a read the documentation guy, my spelling and reading comprehension are horrible. I'll follow guides off YouTube and throw errors at google and try to find a video/post about it or get googles ai to summarize it if I can't access the site like reddit.

But like I said there are quirks for each model which you should read. My esp8266 wouldn't boot properly if I had something in one of the pins. Some boards have specific pin outs, the xiao I have can turn any pin into anything, analog, pwm, etc. Boards have high and low states on the pins which have some secret functionality. My espc6 I can adjust the antenna range by changing the high/low state of one of the pins. Its weird stuff like that you really want to look over the manufacturers docs for.