I once bet $100 on dice, and that was quite a lot of money for me, in my country that's 2 weeks' wages, unfortunately I lost that money, I did it because of my own greed because when I bet $50 I won and tried with higher bets, that was my bitter experience, from that incident I never bet more than $1 in the game
You shouldn’t make bet too much amount in single which amount you are not able to afford that loss. Since $100 is your 1-week income, a lot depends on it, so wasting that money on gambling was not a good decision for you. Always spend maximum 5% of total income on gambling if you want to enjoy gambling. Overdoing it will hurt you financially so gambling should only be used for entertainment and it is foolish to put yourself in danger by enjoying it too much.
Of course it is, and indeed that is the more recommended approach to gambling which is to bet a small amount that you can afford to lose, because this is the only best approach that can make you safe in the long run, don't let you choose the wrong approach to gambling because of course as many have happened that most people are trapped in a cycle of addiction without realizing it because they take the wrong approach and usually this happens because gamblers are too focused on chasing wins so what happens is that they suffer a lot of losses.
Betting no more than 5% is a good approach because I think it makes it less likely for you to run into financial problems or lose balance in your finances and obviously the "moderation" approach can keep you away from other bad possibilities like addiction which can basically make a gambler lose all their valuables over time. On the other hand, it is true as you said that gambling is more recommended to be used as a place of entertainment when you are feeling bored, the reason? because there is no certainty whatsoever for the problem of results at the end of the session, and obviously you cannot take a place that is basically only based on "possibilities" if you really don't want to experience bad things.