Feel below the surface
Touch the potting mix a little below the top layer. A dry surface alone does not tell you whether the root zone needs water.
Water thoroughly, then drain
If the plant needs watering, moisten the mix evenly and allow excess to leave the pot. Empty standing water from outer containers.
Check the conditions
A plant in bright light and warm air may use water faster than the same species in a cooler, dimmer room. Pot size and soil texture matter too.
Check the drainage holes
A pot without an escape route needs a different approach. For many common houseplants a drainage hole makes consistent watering much easier.