I'm no expert so wait for some extra input from others.
When I started I had no help at all, so never really focused on the sand.
I think it depends a lot on where you go, meaning, is it a popular beach for people and not so much for local detecting, popular with swimmers and detectorists, not so much swimmers and more detecting.
Has there been heavy stormy weather or unusual high tides, is it metro beaches or country beaches.
Is your detector designed for wet sand and water or more dry sand ?
Is it salt water beach or fresh water beach ?
ALL of these things change your strategy and also your success rates.
I started with a PI Garrett detector and it found everything metal down to 2'6" without fail, but no discrimination. It was submersible, designed for saltwater diving.
Then an ACE 250 (still use it), cant use it near salt water.
Kato has a CTX3030, uses it anywhere but in close proximity to playground equipment, fine in salt water too.
During the day and depending on weather and tides people sit along lines that are like tide lines, they are the best places to swing walking along a beach after people have left for the day.
When the tide is low or right out, swing along the exposed sand that normally is under water, especially the gutters.
After storms when beach sand is removed try around the cuttings at the top of the beach and dry sand where it has been washed away by the storm, down in the gutters at low tide..
In my neck of the woods, beaches we go to are well trodden by old guys that turn up late at night after summer days and special events, they search the beach and pick up everything but the trash so we usually try other near places and find coins with some artifacts.
good luck
Youtube is your friend...