I want to use a category page as the home page of my blog. Is that possible and how can I do it? It tried it with a .htacces rewrite rule but that didn't worked.
Category page can't be home page (just doesn't work like that).
There are two other options:
Since you seem fine with redirect try following. Create
There is probably some more tidy way to do this with hooks, but nothing I can think of right now.
The most semantic way to do this instead of using a redirect (extra connection time) is to create a custom page template.