If you want to see more of the nitty gritty, there are tons of devlog series on YouTube where you can watch people put together a game from scratch. GMTK’s series is pretty good, though keep in mind that he started with an audience so he had some advantages along the way!
Sacred Forest is another fun series I’ve been following, and ThinMatrix’s channel is popular and has already made a few games. Miziziziz also has a few series but I recommend his 4 devs 1 art kit jam series because it shows how a lot of small games can be made quickly