Ooo now this is a big big big topic…
I’ve done everything from make my own little mini games and my own engines (yes plural) over the past 30+ years to modding a seemingly endless amount of games in an endless amount of languages.
So far for modern work I’d lean to the Amethyst engine (on Rust), it still has some edges that I’d design differently but overall I find it to be the most logically sensible. It’s very programmer oriented but they are working on an editor to make it more accessible as well (though since I’m a programmer and not an artist it appeals to me a lot, lol).
This… is a very huge topic though, could be whittled into a lot of parts, lol.