I can only agree with Yvonne. You can let the lawn grow on its own, but then it will look accordingly, or you can take care of it, but that can also be time-consuming. In addition to watering and mowing, weed removal, fertilizing, and aerating the lawn may also be necessary.
To keep maintenance within limits, you should make sure that the lawn is free and easy to mow. Large rectangular areas can be quickly mowed over and are also easy to water. For small sections, mowing and watering both take longer. If you also border the small areas with set-in concrete stones, the lawn will dry out quite quickly. Here at the street, most builders redesign their usually 3m deep front gardens after a year because you can't water that much there; the water evaporates.
Those who have the appropriate money to spare can also have the watering automated. Especially with the temperatures and dryness of the past weeks, you can otherwise plan about half an hour to an hour in the evening/morning for watering.