I started donating last year, 2 years into my first job. I was unsure then because my impression of charities was that the money probably doesnt go where they are saying, or just a small portion does.

Then I stumbled upon the GiveWell( https://givewell.org ) foundation. Their goal is to identify the most efficient charities using a range of criteria. I decided to start with 100€/month distributed 50/50 to fighting poverty and climate change respectively. I also decided that for every raise I get at my job Id raise the amount by 100€ and have done so once by now. I read that its easier to part with future money than with what you already own and it makes a lot of sense.