Money mistakes in your 20's

Not switching jobs early on, the pay was meagre, still I worked there for 3 years resulting into no savings/investment.

Enabling gambling friends by giving debts! Didn’t work out for either of us. But I always feel guilty that maybe I enabled them more and ruined them. Also I knew they were betting on cricket but I didn’t know the extent of debts that had piled up. Most of them ruined their family wealth, siblings and parents in the process.