The Four Ps

I was never properly taught in school, so I pretty much guess where punctuation belongs. I also never learned the proper rules of grammar, adverbs, adjectives etc.

Eventually in the future, I was looking to teach English as a foreign language abroad. So I really need to learn these things now, before I go and attempt to get a TEFL qualification in a year or so.
Can anyone suggest a good web page where I can learn all these things from scratch?

Take a look at the ICAL Grammar Guide - it’s a comprehensive grammar of English written especially for new English teachers. There are articles on all aspects of English all written in simple to follow language.