Shear advice

I am fairly new to grooming and need some shear advice mainly about what the difference in between different shear edge types. I was taught basically there are straights and curves, but since i started shopping for some new shears to buy sometime in the future, i noticed there are some differences in the edges of the shears, so if anyone can enlighten me on what purpose these different edges offer please pass the knowledge

convex
semi-convex
beveled

these are the only ones ive run into, but if there are more, tell me some about those too

all thought I am a dog groomer, and I can tell you about much anything else... i cannot help you out on that! My boss lady orders shears and I honestly do not know what the edges are! LOL

i did want to share with you that our cheapest shears are our FAV! Its funny, she had to order extra CHEAP shears because we kept fighting over who gets to use them.
they are FROMM blue handled curved shears, and the best thing in the world IMO

its funny that we both had a nice pair of 300-400 dollar shears setting in front of us and we are fighting over the 30 dollar pair