I am a novice FreeCAD user and have also had some struggles learning how to use the programme. I feel as though I am getting there now thanks to help from people on this board and some excellent tutorials on YouTube.
I have found this guy is able to explain things very well. https://youtu.be/SUkjk--WlE8
As far as FreeCAD capability is concerned I found this video absolutely amazing. https://youtu.be/NynInva3j4Q
The other thing I have found that saves me time is to draw my parts with dimensions by hand with pencil and paper before opening the sketch work bench.
I hope you find this helpful.