Q.blocking out sun
Should I block the sun from shining on an over fertilized plant? I over fertilized my garden with a self made compost. I flooded the soil with water. Should I also block the direct sun light from shining on the plants?

If the temperatures are super high and the plants get a lot of direct sunlight, then yes, it's probably a good idea to provide some temporary partial shade.
These articles may help you manage the soil and mitigate any damage that may have been done by the fertilizer:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/fertilizer-burn-in-gardens.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/what-is-fertilizer-burn.htm