In terms of coding challenge, I recommend that you familiarize yourself with Plone by attempting to fix one of the bugs listed here: https://github.com/plone/Products.CMFPlone/issues
I've created notes on bug fixing here:
https://docs.google.com/document/d/1EuZGGhqRVN6yTMOdbFR9jkBYtlBqHNYlcvxJA_C5D3k/pub
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