What OP is asking is strategy, I know people who are placing bets everyday, and people who are weekend players. People who are placing bets everyday are betting on one game or two, they also prefer live betting and betting in second half after they see how teams played first half. Their minimum bet per game is 10 dollars, and I have seen people who place thousands dollars on live bets.
Weekend players are people like I am, I like leagues and championships, I like to make parlay with couple games, place small bet with higher odds to have nice possible profit. Everything depends from strategy you choose, I would say that people who bet everyday knows some sport very good, they follow it and they are professional betters. I`m more amateur when we talk about sports betting, like I said, I bet on well know teams, and I dont place very high bets.
And that is going to be one of the good strategy in betting. If you usually do bet in your known teams then that will be an advantage for you. But I know also some people who are just betting when they saw a match without having knowledge or have some background for both teams who are going to play. They are still more relying to their luck and chance.