Unless you’re overclocking, you should almost always be fine with entry-level thermal grease/paste:
Noctua NT-H1
Arctic MX-4
Arctic Silver 5
Cooler Master MasterGel Maker Nano
Though some of the above-mentioned can handle overclocking fairly well, we still recommend the tried and tested liquid metal paste for those who are serious about overclocking:
Thermal Grizzly Conductonaut
Thermal Grizzly Kryonaut