CSS bugs on Internet Explorer

After playing CSS for about 3 days, i finally found that Internet Explorer is the unfriendlist browsers i’ve ever seen (except Mobile Phone browser) that arent accepting any xxx:hover value, some float bug, etc … i though it was going to be easy to play around with css … unfortunately when i found that the wonderfull internet explorer is displaying some strange stuff when i see my created css files on Internet Explorer (unlike the 2 other major browsers like Opera and Firefox which is showing the correct display) … i just dont know what to do again … since its going to be hard to create css that is compatible with all browsers (i’ve already verified my css file using w3c css validator without any error on my css file) … but IE is still showing some strange stuff .. and after searching for it, i found that its actually IE bug, because IE is not using the Standard CSS definition / terms / whatever from W3C or something like that …. This is going to be hard … (i just wondering what did everyone do to overcome the IE CSS bug ?)