High-Quality Resources & Advice for Productivity & Time Management

[Calcifer]

Hey,
due to the corona pandemic & the end of high school I found myself in a situation where I had much, much, much more free time to spend on my own projects. The problem is that over these last few months I became much more wasteful with my time. I could waste 1 or 2 hours a day without even noticing a big difference in the short-term, but I am currently working on my Life Purpose and I can see that this behavior will waste huge amounts of potential growth - if I don't get this in check very soon.
And since I am now alert & receptive for productivity and time management tips & advice, I thought it would be a wise move to gain a deeper understanding of this topic, so I can prevent unconsciously wasting my time in the future.


But I am still very uneducated about this topic.
                       
                        Do you guys have any great advice about how you deal with managing high productivity and your time?
                        Have you recommendations for good courses that I could purchase that would give me a solid understanding?
                        Or any great books that I could read?

I am grateful and open for any advice!