As you continue to use the web, you'll come into contact with lots of new names and acronyms and systems that will probably seem unfamiliar at first, but it's important to remember that you've already done the important part of the Web - following links to other documents - and the rest is just details to figure out as you go.
Some parts of the Web are well-documented, well-maintained systems with simple, intuitive user interfaces, but making these and keeping them working turns out to be a lot of work, so you're sure to bump into some rough edges here and there. If you ever need any help, contact the maintainer of a service, or your friendly neighborhood webmaster, and don't be afraid to ask for help.