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https://www.givewell.org/ Is a good site for finding charities that create the most good per dollar. That’s what I care most about.

Find some charities that interest you then hit up a site like https://www.charitynavigator.org/ and see if they are in the database, if they are see how they are rated, make sure they aren't spending 95% of what they raise on salaries and advertising expenses, etc.

> Do you have any advice on finding/selecting the right charities

I don't donate to international/national organizations but local ones, or even local businesses I like but who struggle with something. My tip for finding those is to participate in the local business/events landscape in your province/city/neighborhood, and talk to people.