Newcomer here :)

^ As the title says I am a newcomer here . I am interested in making money online, but alas I have no clue how to do it. I already read all the stickies here and other threads, but still cannot understand what I have to do.
I registered in wordpress yesterday, but still have not started posting, because I have no idea what my blog should be about. I wanted to be for my 2 cats, but they live a pretty boring life after all.
And with youtube. I read that I can make money with youtube, but I could not understand also.
I hope you guys can explain it the best way to me, because I just quitted my old job and need some money

Keep reading. You're in the wrong section.

Read, open up a document & document all the useful threads/information you find.

just start doing stuff, thats the fastest way to learn.

Ok...Your 2 cats, thats a start. you can start by making post about your cats then some other people's cats,then for some dogs and other cute animals. After that you can start thinking of driving traffic to your site, you can always try social traffic (you can find more about this on this forum and use the search box). And as a last step you can put some ads (adsense) on your site and start earning money. You can always get a domain name and hosting and start a fresh new website...btw you can find everything on this forum, you just need to start reading while you do things, as celebmann said the fastest way to learn is by taking action. I wish you will have fun doing so...

If you have no clue on MMO, I think that you need more time on reading, not only asking the experienced one like this thread.