Donating money is just not it. It's so easy to spend money you didn't work hard to make yourself. If you wanna do good, figure out how to deploy the resources to your cause.
Step 1: Have a stated cause or known interest
(Most people struggle to reach this step)
The main thing is to trust who you're donating it to. Charities often struggle to do important but boring stuff because donors want to add all kinds of strings to the donation.