How Do You Get Compost

Question

For 5 gallon gardening

Answer 1

You can incorporate manure or other types of compost purchased from the garden center for your 5 gallon gardening.

https://www.gardeningknowhow.com/special/organic/the-importance-of-soil-for-an-organic-garden.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/mushroom-compost.htm

Or, make your own:
https://www.gardeningknowhow.com/special/organic/compost-for-organic-gardens.htm