How to use ghp-import and the full repository

[kwbln]

Hi there,
I have a github repository that I use for a JupyterBook. It is alraedy available and the ghp-imports works fine.
The question ist: how can I oush the complete folder to the same repository?
When I try to "activate" the main branch using git checkout main, git tells me that merges are needed what doesn't make sense for me since my local folder has the lead in that moment.
I'm a bit worried about damaging my local files.
I would appreciate some help. Thanks!
Best,
Kerstin

[c-w]

Could you provide the full sequence of commands that you're using.

[kwbln]

I followed the instructions here: https://jupyterbook.org/en/stable/start/publish.html

In the first round, I pushed the whole repository as described in the article.
Then I made some changes in the Jupyter Notebooks, for example, updated the new JupyterBook, and pushed the book changes using ghp-import.
The question is: how to proceed now?
I can make changes in the book and push them using ghp-import, but when I try to push the repo, starting with changing the branch, the info about needed merges come up.
Should I start with a new repo and always push the whole repo first and the use ghp-import?