Hello Stamp Family!

I am ABSOLUTELY NEW to this stamp thing. I've been into coins/currency for a while, so I've been around stamps in that kind of way (both hobbies have ties together it would seem).
I recently received my grandad's collection & found a collection sheet with stamps that I am assuming might have been some of his "favorites" or something similar since they are separate from the HUGE collection book & boxes of envelopes & bags of stamps.
So I wanted to share & see if y'all have any helpful knowledge about these particular stamps in general.
Also, I'd like to ask about "coil perforations" because I'm seeing a lot of notes under the stamps in the collection books that show "Coil" or Imperf." or most importantly "Coil: Perf. Hor./Vert." & I'm assuming that means perforated horizontally/vertically. On that note, if stamps have straight sides, are the outliers special? I.e. 1 of 4 sides is straight, or a corner pair are both straight, or if 3 or 4 edges are straight?
Sorry, I know that is a lot already... but honestly I'm just so excited to explore & continue his stamp collection! I just want to do it properly aka not mess up any of his hard work.



