What’s the best free budgeting app to use. and what’s y’all’s tips for managing finances?

Okay, so I am 19. And having trouble trying to manage my finances.
I have researched the best budgeting and finances but every app I use. You would have to pay for it.
And or it's not giving me everything I want.
I want to be able to add budgets, see where my money is going, and manage finances.
I have an Android computer and an iPhone so it's getting difficult for me to find an app or a solution to find a app that can go on both devices.
But most importantly I don't know how any of this works and I don't know how to get started

What’s the best free budgeting app to use. and what’s y’all’s tips for managing finances?
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