When I store information on my site I always use a flat-file database, and people keep telling me to use a proper database, but I actually have no idea where to start. I took a look at the already installed modules on my server, and I have AnyDBM_File, ODBM_File, NDBM_File, SDBM_File - but no idea how they work.

What should I do first, how do I learn how to use what I've got and what else do I need? (Please assume complete idiocy on my part and don't use too many long words or abbreviations) Thank you.