A tip on tennis: Since the favourites win about 85% of the time in tennis, you can make good profits. Another tip is that in tiebreaks the favourites always win. The best time to bet on them is when they are behind in the tiebreak.
If you want to bet on goals in a certain match, you have to pay attention to the goal differences of the two clubs and look at the last comparisons of the two. Often, a large part of the squad remains the same. I have already made a lot of money with it.
For games in England, you should almost always bet on less than 3.5 goals, as the goal difference there is quite low – unless Arsenal and Chelsea are playing. In Germany, always bet on more than 2.5 goals, as many goals are scored.
Another tip: when betting on the German league, bet on the first goal in the 16th – 30th minute. This occurs most often.
And one more thing: I have observed the betting scene over a longer period of time and noticed that with odds of 1.10 to 1.20, the distribution of the match outcomes looks something like this:
Home win (1): 95%
Draw(X): 4%
Away win(2): 1%