Best planting advice!
No, seriously. Stick your finger into the soil near the stem and see how damp it is. For most plants, if it's dry, it's time to water. If it's still damp, hang tight. Don’t overthink your houseplant care strategy! Most popular houseplants are so ubiquitous because they have minimal requirements for care.
Here's a troubleshooting table to help you identify some common issues: