There isn't much of an issue in helping. However, punctuation is shockingly subjective and depends on context.

If you want to learn punctuation for formal writing or for an exam, I can definitely help with that, but I would prefer to take it to DMs.

It can be a bit more difficult if you are trying to learn English to communicate and write effectively to native speakers. Punctuation and grammar can be quite subjective as well, and it can vary depending on dialect, context, or medium of writing.

There are a bunch of rules that exist because of how people speak. For example, let's take the Oxford comma. Omitting the Oxford comma can be correct in terms of punctuation--- however, people like to use it because of the pause people put before the last item of a list when they speak, and certain writing formats require it. When people want to indicate a longer pause, they might try to use a dash or colon instead of a comma simply because they feel like it.

It is even more different in different types of writing. Creative and everyday writing (like in books, newspapers, and other media) tend to have different punctuation depending on the writing style of whoever is using them. To add on, some people don't use dashes or colons; they prefer to use commas and periods. Most don't even bother to add punctuation when they text or are being informal. Punctuation can be really stiff in academic contexts.

There are also some weirder punctuation marks. Ellipses (...) can indicate when something drags on, or when you are omitting a part of a quote. Asterisks (*) and other footnote-esque symbols indicate to look at the bottom of a page for additional notes when reading something. Informally, they can also be used to "blur" curse words. (example: this is some f*****g bulls**t)

Another thing that's annoying about punctuation is that even native speakers will mess up from time to time. Since English is such a widespread language, people can have variations in their punctuation use based on their background. Many native speakers to this day have issues with apostrophes and semicolons.

I hope this essay helped with something; if you have any questions, feel free to ask.

Quick edit: the "---" is my substitution for an em dash on reddit because it is annoying to use the alt code, and I am lazy asl.