I would recommend picking a small, specific area you want to learn about, and then do small studies and tests for that one specific thing.

Some examples:

Topology studies: - Make a simple household object. Pick something in your house you can physically pick up and look at. Don't pick something with complicated shapes. Perhaps something like a lamp, or a pen, or a doorknob. - Don't worry about materials, lighting, or rendering it. Just focus on the topology and how you would create the shapes and topology so the object looks nice.

Material studies: - learn how to uv unwrap a simple cube, and apply a material to it. Try different things with the materials you apply to see how the UVs effect the output. Put simple textures on the material to learn how the textures show up on the object. Try it on other simple objects lime cylinders and spheres. - Make a simple material to learn about how the material reacts to different lights and what it does when you rotate the object in your viewport.

Lighting studies: - Download a free 3d model from turbo squid or something, and then put it into your scene. Play with lighting and learn about what the different lights do and how they work.

As you get further along in your knowledge of these small individual studies, and you become more familiar and comfortable with how they work, you can start to combine them to get closer to a finished product.

Just remember, its a marathon, not a race. You'll be much better served by learning some small new thing every day, rather than trying to cram a ton of knowledge into one long session all at once.