Q.soil conditioner
How to make your own soil conditioner?
Certified GKH Gardening Expert
It depends what goal you want to achieve with your soil. For example, if you have clay soil with poor drainage, you could condition it as described here:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/how-to-improve-clay-soil.htm
https://www.gardeningknowhow.com/special/organic/how-to-easily-improve-your-clay-soil.htm
Or if your soil has too little water or nutrient holding capacity, you could add peat moss:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/peat-moss-information.htm