One trait of a good developer is a person that can write code, not copy and paste it only. Or at least doing the former much more than the latter.
I was a copy and paste developer for a long time, relying heavily on Stack Overflow code that I would snatch and then alter to meet the conditions of my own purposes.
Now I’m not saying you can’t do this, but you should reach a point where you can produce a lot of code from scratch, talking through it out loud and actually “writing code.”
You can complete the lessons in sequence, i.e. 12 days, or you can plan to do them every other day, perhaps 3 days a week and complete it all in 4 weeks. It’s up to you.
More info can also be found here.