Thought Cabinet rules

The Thought Cabinet has 12 slots, with 3 open at the start. Unlocking another slot costs 1 skill point; forgetting an internalized Thought costs 1 skill point.
Research effects and internalized effects are separate. Read both on the Thought’s page, along with its research duration. Its solution text stays folded until you choose to open it.
The Thought Planner lets you select Thoughts, track their research, unlock slots and account for forgetting costs. Enter the research time you want to advance; it does not run a real-world countdown while you are away.
Use the links on each Thought to inspect affected skills and related checks. When comparing a check, mark the conditions that apply to your playthrough rather than treating every listed bonus as active.