The key to solve conflicts: see the two conflicting diffs

The key to solve conflicts is:

You have to understand what are the two commits that touched a given line (one from master, one from features), and then combine them somehow.

Or in other words, at every rebase conflict we have something like:

master-commit    feature-commit
|                |
|                |
base-commit------+
|
|

Therefore there are 2 diffs that you have to understand and reconcile:

 Ancestors