Steve, if I may add https://access-programmers.co.uk/for...d.php?t=225837 as suggested reading.
balexa5701: some good advice there. Predicates such as frm, rpt will tell you right away what you are dealing with. Perhaps not necessary for those with a photographic memory, but certainly useful for those who may have to troubleshoot your design or code later! Who knows, that could include you 
I have lots of other links that I frequently pass on for beginners if you care to review them.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.