Some people love and knows everything about soccer why some people love and knows everything about basketball, so also table tennis, volleyball, baseball, horse racing, handball, snooker, boxing, cricket, golf etc. Any sport you know very well, you can gamble on those sport and avoid gambling on sports you know nothing about, one of the reasons why some set of people lose money a lot when it comes to gambling is because they gamble on sports they know nothing about with the slogan " gambling is all about luck" yes gambling involves luck but that those not mean skill and knowledge is not involve, if you gamble on sports you know nothing about then you are gambling blinding and your chance of winning are very small compared to when you know everything about that particular sport, when you know a lot about a particular sport prediction will be easy for you.
Is true that knowing everything about a particular sport those not grantee you winning always but is an added advantage when you are gambling because it brings you more wins.
Jack of all trade in gambling is one of the reason why alot of gamblers lose money a lot. There is one gambling community I am on Telegram and there is something I noticed many of them do. If some predict a game on a particular sport, could football, basketball, handball or hockey. As soon as they noticed one gambler has won one particular game, they rush to play it and the funny thing is thag casino tend to change things when they notice an Influx of user to a particular game, they know someone must have win so they increased the lower line to make it harder than the way it was before.
If you are very good at what you do and I don't have a little knowledge, if you share me such kind of game to risk some money, I will not unless I want to have some fun but the amount I will put is going to be too small that it wouldn't be enough to feed me or for transportation to go buy something, that's how serious I'm with gambling on what I don't know.