u/Front-Conclusion3017

I have been thinking of starting to learn frontend development seriously. I have already tried once and have quit in the middle, but this time I wanna see it through to the end. I am already familiar with HTML, just need a quick brush-up? So long does it usually take to learn frontend and become a decent frontend developer?
Also, is there any particular thing I should keep in mind while learning frontend? Also, are there any tips you’d recommend, like how to start or what kind of projects I should work on?