OT, but this seems like an appropriate place to ask. I'm a competent computer programmer who hasn't done any front-end web development since 1999. Does anyone

OT, but this seems like an appropriate place to ask. I'm a competent computer programmer who hasn't done any front-end web development since 1999. Does anyone have a link to a good explanation of how to avoid these "obvious" mistakes? Most of what I've found via google has been along the lines of "put interesting content above the fold" and "have consistent site navigation area," whereas I'm more interested in character encoding, where and how to specify CSS, when to use span vs div, and that sort of thing. Thanks.