1. Here I take some notes of my work.
'Here' is confusing.
I think you meant, "I am taking some notes of my work"
2. There are still many places that I've not been to yet.
It's correct, though a little formal the way you've done the contractions ("I've not been")
In conversation people would tend more often to say "I haven't been" instead of "I've not been".
"There are still many places that I haven't been to yet."
3. I write down everything in my life journey.