I would strongly recommend getting a good-quality power supply (PSU) with an 80 Plus Bronze, Silver, Gold or Platinum efficiency rating.
The better efficiency means less heat.
If possible, choose a modular semi-fanless PSU.
A modular power supply provides connectors at the power supply end, allowing unused cables to be detached from the power supply.
Less and flat cables mean less clutter and better air flow.
However, be sure to choose a PSU that fits into the case, as modular PSUs are often longer compared to standard ATXs.
Smaller SFX PSUs are often used in mini-ITX cases.
Another alternative is a PicoPSU that is small and efficient PSU. You will need to get a PicoPSU and an external AC/DC adapter.
I’d recommend PicoPSUs to advanced builders.