would using thermal paste on my stock ryzen 5 3600 cooler be ok? Or is it not beneficial?
The stock cooler should have pre-applied thermal paste, the grey square you see on the bottom of the heatsink is the paste. Additional paste is not required and will be detrimental.
The Wraith Stealth is a bad cooler. Try the Cooler Master 212 evo or the smaller Antec a40 pro. Thermal Grizzly Hydronaut is a very good paste.
You can use a small screwdriver to put a rice-grain-size blob of thermal paste on the CPU in the middle. Also use it to straighten any bent pins. Renew the paste every 12–18 months.
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