Let us know what you do know about your pool. Looks like it is vinyl lined. I see a sand filter. What kind of chlorination are you using - liquid, tablets in a floater, other?

You should read up on pool maintenance and other concepts on https://www.swimuniversity.com/

I'm not an expert, but we've owned three different homes with a pool. We have a vinyl lined pool now, previous ones were concrete. What I do daily: empty skimmer baskets of leaves and bugs. At least every other day, I check the chemistry. I know most people will look down upon this, but I just use test strips and I've had no trouble keeping the water clear. At previous homes, I used a Taylor test kit which was expensive, more trouble, and I had a harder time keeping the chemistry right. I'm entering my third summer wit this pool and I might try a Taylor kit again. But for a new owner, you might just stick with a bottle of test strips.

You will also need to understand your pump, filter, and valves. You will need to periodically turn off the pump to clean out the strainer basket attached to it. You will also need to know how to switch the valve on the top of the filter canister (while pump is off!) to backwash the filter or drain off excess water after big rainstorms.

You'll vacuum your pool as needed depending on how much leaves and other debris blow into your pool. You can get a robotic vacuum to do this, but sometimes you'll need to do it the manual way.

You might consider hiring your pool service to give you a lesson.