Welcome to the Cycling Community!
What a great gift from your grandfather. Funny to see the Tour and Giro are followed in Venezuela as well.
I'm not very experienced in bike mechanics; I only know the basics, but I like to learn, and any advice is appreciated.
I see you're doing quite a bit yourself already. Besides that Youtube can be a great resource for maintenance videos. Or you could ask the community in the Discord Server (although that isn't very active).
Looking forward to see more cycling related blogs from you.
I'm adding the Cycling Community member badge to your profile.