I think different people call it different things. Loose lead, for us, is that Hazel is walking on our left side, her shoulder isn't further forward than the leading leg, and the lead has a 'smile' or a 'j' shape. Our training organisation holds the view that a dog can still be 'pulling' even if the lead is loose - imagine a 5 metre long line: the dog could be 4.5 metres in front of you and the lead could technically still be loose.
Focused heel is when she's giving me her full attention and looking at me with every step.
We use 'side' for heel position, 'heel' for when she's actually walking beside us, 'switch' for if we want her to walk on it other side. We use 'close' when we're recalling her and we want her to come and sit in front of our feet, facing us.
Our trainer introduced a new cue 'behind' when we want her to take her treat from the opposite side - it's just a slowing/focusing technique. She darts behind our legs, collects the treat, then returns to heel position.
We also use an auto-stop. If we stop while walking, she sits. Then we continue and she resumes.
It's all work in progress, though. Practice, practice, practice. Then building distractions, durations, etc.
@HariboFrenzy HariboLab is in peak adolescence. We have a 13 month old lab - she has good days and bad days. In fact good hours and bad hours. He'll come through. Certainly don't re-home him. Ignore advice from people who think they could have trained your dog better. They are just seeing a snapshot.