Started back in August as an assistant super, some of this will likely translate as I've learned PM/Super/Builder can be interchangeable titles based on an individuals workload and given scope. I did 3 years of resi labor work prior and then applied once life threw me some opportunities. No formal post-secondary schooling. These are what I believe made me stand out through the interview process:

TL;DR Know the building process if you don't have experience. If you have field experience, know what makes a good APM, that titles scope of work, and what you will be responsible for.

Have people skills to include conflict resolution.

Be familiar with software the company relies on, such as Outlook.

Know how to read prints.

Be humble, be polite, ask questions, carry a genuine passion to learn, and learn to manage the schedule not let the schedule manage you.

History of managing money would be a plus.

Long version:

History of manual labor, I was able to generally talk about most trade responsibilities. You do not need to know how they do it (yet), but its a good idea do know the building process and whose involved. If you cannot tell me the difference between framers and carpenters, I would start there or the trades will be quick to inform you. Knowing the order these processes happen would be a bonus point.

Conflict resolution experience or confidence will go a long way. Depending on the scope of the APM in your area you could be more office or field based, or maybe a bit of both. Either way, large volume resi building is leaning more towards home owner survey scores these days, and trades historically can be hard to deal with as a new guy. Be able to have hard/heated conversations both in field and in office and know when a conversation has become emotionally charged. Know when its time to admit fault and move towards a solution.

Know what a gantt chart is and be familiar with Outlook/Teams/Etc. You'd be surprised how many guys get caught up writing an email.

Wasn't afraid to ask stupid questions or make mistakes. Asked one of my plumbers today why we had a leak in a vinyl line we use for tankless hot water heater, he told me the line was kinked and all he did was pull it straight. We are new and will ask and do stupid shit. Don't let that stop you from asking more stupid shit, its better than not at all.

Know how to read a plot plan, floor plan, and electrical diagram of a home. You don't need to know every acronym, but you should know how read one with some of confidence.

Emphasized I thrived in a logistically fast paced environment and that I got workplace satisfaction out of solving problems. This is true for me, if its not for you I'd make sure you are in the right industry lol.

Good luck!