Design a focused reading list for onboarding to a new domain

I'm onboarding to {{NEW_DOMAIN}} as a {{JOB_ROLE}}. I need to be functional enough to contribute in {{TIMEFRAME}} (e.g., 2 weeks, 30 days). My existing background is {{EXISTING_BACKGROUND}}.

1. Identify the 4-5 core concepts someone must understand to operate in {{NEW_DOMAIN}}. For each, write one sentence explaining why it's foundational and what goes wrong if you skip it.

2. Build a sequenced reading plan with exactly 8 items total. Each item should be:
   - A type of source (e.g., 'official documentation overview', 'practitioner post-mortem', 'introductory textbook chapter', 'annotated worked example') rather than a specific URL or book title (links go stale; source types don't).
   - Labeled with its position in the sequence and a reason it belongs at that position.
   - Matched to one of the core concepts from step 1.
   - Accompanied by a guiding question I should be able to answer after reading it.

3. Flag 2 common onboarding mistakes people make when learning {{NEW_DOMAIN}} on their own (e.g., going too deep on theory before touching practice, ignoring naming conventions that cause confusion later).

4. Suggest one low-stakes practical exercise I can do after item 4 to pressure-test my understanding before continuing.

Note: This plan is for orientation, not mastery. If {{TIMEFRAME}} is shorter than 2 weeks, tell me which 4 items to prioritize and which to defer.