Adventures with git rebase.

I have little experience with git and to update the boilerplate, that my code is built upon, I went through the following commands:

First of all, I want to state that I think it is a horrible idea to throw Vim at someone, unless the user specified somewhere, that she prefers Vim dialogs for git operations.

But I was able to execute the rebase command, and now I'm left with a bunch of merge conflicts.

My question is, how do I resolve them?
I remember a dialog, that Webstorm gave me in the past, where I was able to see all the diffs...

... while writing this, I tried typing conflict in search for actions and was led to the dialog I was looking for.

So my question is answered, but I want to suggest opening this dialog automatically. 

...

I have now resolved all the conflics in the dialog.

Having never done this before, I was confused that I was in a detached head. I just assumed this was because I'm in the middle of a rebase.

Then I entered git rebase --continue and was surprised, that I'm hit with more unresolved things.
I had to resolve the package json files... fine. But after the next --continue it seemed as though it was working, but then I was inside thrown into vim and asked to commit with a message. I wrote something and entered :wq! and now there are more conflicts.

I took a look at my history:

the commit marked in the screenshot is the last commit. I did it right before I started the whole operation. The commits above are older.

I have no explanation for that.

Perhaps someone does?