Because it is difficult to learn everything at once, this is the greatest technique to learn quickly. We are continually learning.
We can not know everything at once. We must crawl, learn, practice, improve our crawling before we can run.
When I first started learning in this forum, looking at how other members' comments were organized helped me a lot. When I read a comment or post and want to learn how it was done, I usually use the quote bottom to see what functions he used to structure the reply or post in such a way.
This is how I learned too.
Click on Quote and you will see how that poster made that post with something you want to do for your post, like bold, underline, strike, highlight (glow), add link and more. It is an easiest way to learn from a post and repeat the same thing for your post.
If you want more advance, you can find in Help page or can ask forum members.
Another way is to search about guides for SMF forum.
Welcome to the SMF Online Manual