I agree with the recommendation to use (z)diff3. I think the article massively understates the case! Three way diff makes it possible to resolve some conflicts that are literally impossible to resolve without it. Why impossible? Because with default style adding conflicting things at the same place is indistinguishable from removing the same things at the same place. You need to be able to see the base to determine that.

I wrote up more here: https://stackoverflow.com/a/63739655/997606

I also wrote up how to use diff3 style to make resolving rebase (or merge) conflicts a mechanical procedure: https://h2.jaguarpaw.co.uk/posts/git-rebase-conflicts/