But don't expect it that it can be done on a few weeks or you have to find the "golden egg"
Can't agreed with that.
If you want a good gain on sport betting you must have luck and if the bet goes against you there is no stoploss or trigger who helps you out managing the risk. Or to keep it simple you lose your whole bet. The only one who's getting rich with sports betting is the bookmaker. That is the only winner.
I prefer trade coins,forex,stocks with the useage of 3 important factors: Technical Analysis,Fundamental Analysis and Sentimental Analysis.
Develop your own system with technical indicators and you can safe yourself a lot of money when a trade goes against you.
If a bet goes against you, you lose everything in 1 strike. And what is the profit on a "safe bet". 6%? 7%?.