I dunno if I would class them as secrets but some things I find useful which I guess I could pass off as advice are -

Automating savings, you can set up monthly transfers to your savings account. You can Use cash back credit cards, earn while you spend. Maybe invest in low cost index funds, they often outperform actively managed funds.

Utilise tax advantaged accounts: Maximise 401(k), IRA, & HSA contributions. Always try to pay off high interest debt quickly. It reduces total interest paid. Regularly review your expenses, try to cut unnecessary costs.