The handbook is a bit over cautious. It recommends doing it every time you refuel, and suggests oil consumption could be as high as a litre per 1000 km (625 miles)
Although this is possible on a very high mileage engine, in practice I have never needed to top up engine oil between services on a reasonably low mileage car.
Best to learn how to do all the the under bonnet checks as shown in the handbook. - oil dipstick and a visual check on brake fluid and engine coolant level.
I just check them whenever I top up the windscreen washer bottle , which i would do anyway before a long journey.
In theory checking the oil dipstick is easy but its not always easy to see very clean oil on the orange marker section that indicates maximum and minimum. A useful tip is to gently lay some absorbent tissue against the oil. It will show up better as it soaks into the tissue.
If you have already done half your expected annual mileage and the oil level has only dropped by say a quarter so far its not necessary to top the oil back up to maximum.
The brake fluid is a see through container with the max and minimum level marked. The coolant bottle is see through. The correct level is not full up. The maximum and minimum level are marked by bars. Check this while the engine is cold as levels can vary by temperature Despite what the handbook says I dont advise attempting to top up brake fluid or coolant yourself if you think the level is low. Its not normal for their levels to drop in service. Consult a mechanic.
