BUILD SOMETHING.

Learning concepts without the ability to apply them are essentially useless.

Get your hands dirty and build something that would be valuable to you and solve a problem for yourself.

Don't get hung up on doing it "right". Focus on making it work. Don't worry about how it'll work for a million users. Right now your focus is on making it work for one user.

As you go you'll hit walls. Research how to get past them and keep going. Again, you're going to make mistakes. DO NOT GET HUNG UP ON THIS.

Making mistakes is part of the journey. Even the best software engineers in the world rarely get things right their first try. It's part of the process.

Like others have said, practice is key, however I'd like to add that you should not feel too discouraged if it feels like you're making no progress. You're probably making more headroom than you realize. At least personally in programming more than anything else I have occasionally only seen results after I came back to a concept I gave up on learning.

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Do be aware of getting stuck in local minimum though. I know it probably feels like bad advice but I figured I'd give it since it helped me personally, so maybe it might help someone else.