@inquiline these are good ones, also if you want a single fact that sums up a lot, France still effectively controls monetary policy in a lot of its old African colonies, in part by forcing them to invest half of their national reserves in France:

https://en.wikipedia.org/wiki/CFA_franc

There are many more flows of colonial wealth to European nations that continue to this day, but this is one of the more explicit ones. So if you've ever wondered why African colonized nations seem to be "developing" forever with no end in sight, the answer is because most of the profits from their natural resources flow outward back to Europe, plus they're saddled with endless debt through the IMF, etc. Colonialism is very much not over today.