Brief you can lose all your hard earned money with gambling. We can't provide an exact amount which we can lose through gambling because it's unlimited especially if the gambler is addicted.
especially those people who do not have knowledge about bitcoin and do not have any skills and besides this they come and spend their money into gambling, they lose all of them, it is not only the matter of gambling but in any field if you do not know about it you will lose there.
You do not need to study gambling that much if the games you loves to play are those type of games that has a house advantage because no strategy would work, you just need to study on bankroll management and know your purpose in gambling.