If your goal is to become a good programmer, I'd say the best marketing is just creating great code. Contribute high quality code to open source projects you use and love, meet the maintaners and other contributors, etc. The programmers I have the most respect for are the ones that consistently pop up on Github as being related to projects I use and love. I've never admired any programmer that just goes on Youtube and says "hey look at me, I'm a good programmer!"
If your goal is to become a good programmer, I'd say the best marketing is just creating great code. Contribute high quality code to open source projects you use and love, meet the maintaners and other contributors, etc. The programmers I have the most respect for are the ones that consistently pop up on Github as being related to projects I use and love. I've never admired any programmer that just goes on Youtube and says "hey look at me, I'm a good programmer!"