I am asking here for your help and advice on how to read holes schematic notations.
On the attached picture I've marked with a green color part of notation that I don't know how to read / understand. And will be thankful for any advice on how to interpret this notes.
With the red color I've marked a holes with countersinks. But I'm failing to pick up necessary details from the sketch to understand the size/angle/depth of this countersinks. (I understand that they can be missing, but I tend to think that they might be in the notations that I don't understand)
Thank you for considering this question!
source: the drawing was taken from this youtube video - link