hi there guys , im totally new to D&D and had a blast the last few days plyig the game
after reading for about 7 hours before making a character im still lost as to how the system works.

i cant seem to find any info about AC ac+1 dex/20x40 ,

you know all the maths dice thrown etc.

im really lost even trying to know wich saves helps and how many chance i get

heck i dont even understand the concept of plate armor with dex etc.

only thing i get is the spell failure on heavy armor lol

someone would like to point me to something that might help?

Thx