is there courses about quantum mechanics on the net?
yes. leonard susskind has a lecture series on QM on youtube
Along with Susskind's series, there is an MIT lecture series available on video as well, but you can't see the blackboard well enough to follow what they're doing.
Here are a number of course materials that you can find online. There are many more.
Just search on the internet: click.
Maybe you can tell us at what level you are?
Separate names with a comma.