How does the gitlab pipeline work?

Question

GitLab

Hello!
There is an application in the C# language, it is uploaded to gitlab and the task is to go through the pipeline, and after reading the documentation on how this pipeline works, I got a strange feeling that in the file. gitlab-ci.yml instead of any commands and structures, you can write in plain text that they say you NEED TO OPEN THIS, THERE ENTER THESE DATA, and I don’t know if it will actually be possible to do this and whether such a statement has the right to life ? If so, are there any features for the C# language and where can I read about it?
And if my statement is the nonsense of a madman, then what would you advise to read so that a clearer idea of ​​\u200b\u200bthis appears and it is described in detail about commands and constructions? (had nothing to do with the pipeline before)

Answer 1

The question is some kind of wild stream of thoughts, so I'll throw off a link to an article on how to set up gitlab ci for .net core
https://dev.to/denolfe/build-net-core-applications...
And a link to the documentation :
https://docs.gitlab.com/ee/ci/