How to Cast Healing Word in Combat?

Mud doesn't help very much in combat. It's for ability checks and like a attack rolls non ability check, right? Give it back look. Concentration up to one hour. Could I cast healing word while I'm concentrating on this? You only drop a concentration spell if you cast another spell that requires concentration. One bonus action is a casting time. So it's actually not like my my action? No, yeah, you still have an action then. It's bonus. Oh, it says one be a on time. That's fancy as hell. What do I do? Attack throw.