For blender it's the tradition (and expectation) of using youtube tutorials. There are also quite a few courses available for cheap on Udemy and the like, which means they might also be available on less legitimate places . These courses will teach more theory rather than having you copy steps.
The best advice I can give is to keep trucking, and make things you are interested in, and which look interesting - but keep it within your scope of skill. Find artists you enjoy on Artstation/Youtube/Sketchfab, and try and replicate what they do. Knowing why/how things work is better than learning how to do the same trick everyone is doing.
Blender is great to learn box modeling in, so perhaps start with that and learn by doing a bit every day. I myself taught myself Blender by creating low-poly versions of my DnD characters, inspired by the-regressor on tumblr/sketchfab.
Skills are transferable, so once you've got the hang of that, step it up and go for more complicated subjects.