When to water: Ditch the schedule as it depends on the plant type and maturity, the pot, the soil, the weather and so much more.
How to water: Watering slowly and thoroughly, but less frequently, is the best way to ensure water reaches all the root zone. When we say thoroughly, we mean saturating the substrate, not just til water has run out the drainage holes.
Watering effectively if your plant is in low light and/or has poor draining soil is very difficult. It’s important your plant has a good view of its closest light source, and you improve the drainage.