How to use coffee grounds to improve your garden

“I know that coffee grounds are beneficial to soil, but in some places I read that they should be used in compost formation only. Some other sources claim that coffee grounds should be simply mixed with regular soil, including in existing pots. Which is correct? In some places, I also read that coffee grounds will deter pests after being sprinkled around the perimeter of a raised bed. Is that true?” – Reuven Koter, Woodland Hills
If coffee grounds are beneficial to gardeners, w