Neither do we since you don't say what it is or what you expect the purpose might be.

this is the back wall of house, and above is a shed

Clean out all the debris and get an engineer in there to find out what is structural, sound, and required.

everything is healthy engineer did a survey

these are columns 2 meters underground to support the foundation but i don't know how to cover them

Take a picture from further back so we see how this actuallu relates to the house . Also where you live since this does not appear to be NA.

To the original poster: please consider changing your user name to something more memorable so people will recognize you more easily. Something like "Fixer upper in Bulgaria" would be easy instead of HU-nnnnnnn

@ Patricia, this is the same person who posted

https://www.houzz.com/discussions/6390093/i-bought-a-house-and-i-need-a-lot-of-help

Clean it all up. Haul away all debris. Take down the rusty roofing and the metal struts holding it up. Start fresh. Then see what you have to work with. The bays between the foundation walls could have different purposes. A place for grilling, seating, eating. I would consider when time permits…creating a patio there, perhaps even a seating area with pea gravel. And over head, building a pergola for shade over the space. And, over time, allowing a vine to grow over it for shade. A grape vine, perhaps??? I would keep the glass windows, cleaning the up and painting the frames black. They add interest to the space.

A workbench would be very useful as you renovate your house.

clean it up and get a roof over it.