uuuuug percentaaaages blaaaah. okay line up D&D class
it's not percentage in D&D nor in this game despite what that bullshit % stands for, it's a lie straight up.
Way it works is like this.
Your target has an armor class 10+armor score+dex (maybe heavy armor doesn't count dex, and some medium armors limit the dex modifier.)
Say your enemy has an AC of 15 (pretty standard from looking at everything in combat log)
So you roll a d20 and have to either tie or beat that 15 (1's fail automatically, 20's always hit for double the damage)
If you have the mentioned +3 to strength, and +2 to profiency for a total of +5 your only need to roll a 10 or above to hit.
add a +1 weapon now you need only roll a 9 or higher to hit.
Now if your unlucky and can't get a good roll your screwed which is why the % is a lie.
With advantage your rolling twice doubling your chance of getting what you need.
with disadvantage your rolling twice aaaand halving the chances of getting what you need.
So +1's are rather handy to further lower the number that you need in order to hit. And sometimes that is a woooorld of difference especially if enemy has an AC of 18 meaning you only have three numbers that will result in a hit, or if there AC is over 20. meaning unless you roll a 20 your not going to hit.
