I have the Woodpecker book, if you like tactics/puzzle solving
then it's a good thing to do if you can spare the time.
Every single puzzle is taken from a game played by a former (or current)
world champion, which is nice.
You will be forced to time yourself as you go through them each day,
then after so long you repeat the process over again with the SAME puzzles,
until you complete them all within 24 hours.
As for databases, every single OTB game I've ever played since May 2017
has been input on my copy of Fritz 13, purely as then I have quick access to them
if I ever want to reference previous opening approaches or share certain games.
So to answer both questions... Reveal Hidden Content