Combat in quickstart rules
Hello everyone. I am playing the Embalmer's Lodge domain through the Quickstart rules. I found it a little unclear how the combat works. I understood that the attack is an opposed check. So I get my attack stat, modify it reducing the enemy's relevant skill (combat skill usually), add 50 and then see if I roll less. If I do it, the attack succeeds. Right? But in the rules it says that the target can spend a Reaction to try to defend. So it means that I roll for the enemy (a monster, say) too?
And the other way around, when it is an enemy action, I roll on his action list (no roll for his attack) and only do a defensive roll for my character to try to defend it?
I am just trying to understand if I am not rolling more than I should. Thanks!