[W3 Schools] has great [W3 Schools Tutorials] and [W3 Schools Examples] of different technologies. They also have a [W3 Schools References] section. If you don’t have any books, or prefer learning online, I highly recommend this page. You can quickly pick up and implement HTML, PHP, SQL, and CSS. There are handy menus, but be aware that there is more information available than there is in the menus. They do have an excellent Google Search bar.