Keep notes on the residents, including who needs ambulation assist, stand by assist. Whether they have bladder or bowel incontinence. Memory loss, confusion. Dietary, fluid restrictions. Most facilities have a sheet or grid with this type of info.
You want the resident to be as independent as possible, so it's good to know if they need help standing up, or want and can do it themselves. My experience with AL is they want to do as much as possible for themselves.
With some residents, asking another aide to show you how they perform certain cares. Like 'show me how you get mrs. Smith into the shower'. Personally, I like to keep things the way resident likes it and not have them complain about the new guy.
Somebody on this site said they always ask the aides ' what is the most important thing to know about this resident'.
Good luck and congratulations on your new job!