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:
  • base-commit to master-commit
  • base-commit to feature-commit