Lots of people have done a lot of work to produce an enormous amount of material that is available on-line. Here are some of the best sites.
Star Trek may be one of the oldest and most recognised SF shows around, but it is certainly not the only one. Here are some other SF shows that I like.
As well as the "serious" web sites, there are other people who, like me, enjoy having a dig at some of the silliness that gets passed off as SF. Here are a few interesting links.
Star Trek is fiction, but there really are exciting things out there that we can see from here on earth. If you want to learn something of real astronomy, have a look at some of the sites below.