Q.When I Plant Plants In My Garden Most Of The Plants Die.
I put new potting soil and cow manure, but something must be missing in the ground or I am really doing something wrong. Please help.

Certified GKH Gardening Expert
There could be a lot of reasons, but here are some things I would check:
If you are concerned about the soil, get a soil sample and take it to the local extension center for evaluation.
Make sure you are planting in the proper light, for example, full sun, part sun or shade, for the plants you are planting. A plant recommended for shade will burn up in full sun. The tag will specify. It will also tell what zone the plant thrives in and make sure it is your zone 5.
Water only when rainfall is insufficient. Many plants die of overwatering.
A little cow manure goes a long way. Just spread about an inch on top of the soil and work in once a year.
https://www.gardeningknowhow.com/special/organic/the-importance-of-soil-for-an-organic-garden.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/improving-garden-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/compost-as-soil-amendment.htm
https://www.gardeningknowhow.com/extension-search
https://www.gardeningknowhow.com/special/starting/how-to-start-your-flower-garden.htm
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-5/zone-5-gardening.htm