The only problem in online is cutting card you never know how deep your deck it....
You can never win over house in the long run in online casinos. also you cant make steady profits from gambling ,its not a job ?
How I can win in the long run against live casinos?
I think you could play poker or something in real life its pretty profitable on a long term, you should first do it with family/friends and later on in a casino.
Do not use a high amount if buy in because there is a chance you will lose of course.