@Yuuki ok, then dive into html 5 is probably a good starting point, but let me dump some other useful things for when you start doing this ina professional capacity
caniuse.com is fantastic for figuring out what works on which browsers
html5boilerplate.com is a nice resource for starting a new site from scratch. a lot of web standards experts are involved
then there is modernizr.com fir more older/newer browser support
