When to use the imperative vs subjunctive

P.S. I read your notes at https://kwiziq.learnfrenchwithalexa.com/my-languages/french/glossary/51 and I still dont quite understand. what would "avez confiance mes amis" mean? Surely the imperative is used to express commands as well?

Hi... I've been round the houses on the internet reading all sorts of notes and came back here and realise these notes told be what I needed to know all along... ooops sorry.... avoir and etre use an irregular form of the imperative which just happens to be the same as the subjunctive...LOL... I should have had more faith in your notes in the first place :)