some fun games to build up your knowledge:
Seterra quizzes - lots of 'click where on the map [place] is' games
Worldle - guess a country by the shape of its outline, with the distance/direction if you get it wrong. You can also guess capital, neighbours, population, flag, currencies, major cities, and size
Globle - enter the name of a country and get a warmer-cooler colour for how close the target country is
Globle capitals - similar, but with capital cities
Flaggle - a flag divided into sixths, and each guess reveals another portion along with distance/direction as a hint
Wheretaken - guess which country a photo comes from, then guess the capital, capital's location, a landmark, the landmark's name, and which city another photo comes from (this one can be tricky: pictures come from wikimedia commons so sometimes it's like... a gutter)
Geoguessr - drops you somewhere in the world on google street view and you can navigate around trying to to guess what street in the world your drop point was
I started playing these daily a couple of years ago, and now I can point to almost any country on a map (South Pacific is still a little tricky). Along with trivia like flags and capitals, I've picked up a lot about different places' architecture, languages, and foliage. Often when you play these you'll become curious: why does a Spanish-speaking country have a French-sounding capital? Why is there a really long edge on that border? What does the bird on that flag represent? Where is that beautiful temple in the picture?
You might feel stupid at first, but it's really exciting to realise you're improving.