What is a good book (or books) to learn LAMP (Linux + Apache + MySQL + PHP)?”
Obviously, it’s hard to pin down a single source of online documentation for Linux with its multiple distributions, but once you settle on a distribution, you will find that documentation for it exists and is usually ample. As to the other pieces of the puzzle, here are links to the online documentation: • Apache • MySQL (this is the 5.0 manual; manual for previous versions is still available here) • PHP The differences between PostgreSQL and MySQL… PostgreSQL is object-relational (while MySQL is relational), its data formats are generally incompatible between versions (so if you want to upgrade a PostgreSQL server, you must dump the data ou