Greetings!
Student are say that whatever we see in social media, it is difficult to remember such videos. Not getting all the materials at once. That there should be a book in which all the material to be practiced together so that we can do this without any help.Doing some simple training exercises before you bring out the fancy paper and start to create your next masterpiece can make all the difference to your work, I promise.
First of all it'll warm up your body, specifically those parts you need for drawing, like your fingers, wrist, shoulder. Your linework will be much more secure after a few minutes of practice. Secondly, it'll give your brain some time to change gears, so to speak.
The thing is, our brain processes information during our everyday life differently than when we're making art. If we noticed every little detail, texture or convergence line walking around the office it'd would completely overload our system.
For a painting session on the other hand you'll want to perceive all of these things. You'll want your brain to basically take off the blinkers and switch into 'receiver-mode'.
Instead of your brain registering 'tree' we want it to see that particular tree, it's specific shape, colour, branches and foliage.