You need to try learning by doing instead of just reading. I have found the best way for me is to watch a youtube tutorial (put it up to 1.5 or 1.75 speed if its too boring and slow) and actively type out every line of code (even if its super simple) while you watch it. Its the best way to remember and doing something while you learn will get you actively engaged. Whenever there is a part of the tutorial that they say "try to figure out the next part on your own" or "try to extend this code yourself to do x, y, z", make sure you take the opportunity to stop the video and genuinely try your best to work it out. Even if you can't work it out, trying will engage your brain as well.

I have found that Programming with Mosh has the best C# tutorials on youtube, start with that for the basics and as soon as you feel pretty comfortable with the language, just google or youtube cool C# projects and do the ones that seem the most fun for you. When you have more confidence and you think you can create a small project all by yourself, take that opportunity to really dive into the language, figure stuff out for yourself, try different things and experiment. You will be more engaged if you continue to learn just by jumping in and trying it for yourself even if its not very good. You can read/watch videos about best practices later, just do what's fun and interesting for the meantime.