To my mind you can't beat hands-on experience. There are comprehensive help files and tutorials in with the program which are as good or better than books to my mind and don't involve any extra expenditure.
Hands-on: Acer Predator Triton 700 review
D&AD Awards 2017: see the best design, advertising, illustration, animation and VR of the past year
How to lose weight with an Apple Watch
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.