A content pillar is a theme your content keeps returning to. My Brand called them content topics. Three to five is normal, and Brain takes up to six, each with up to six topics beneath it and a share of your posts. You edit them in Brain, on the Profile page, under Content pillars.
Why they matter more than they look
Explore in Videos is built from them. Along with creators like the ones you follow, your pillars and their topics are what Vamos matches videos against.
That has a direct consequence. Empty pillars mean Vamos cannot match anything to what you make, and Explore has little to go on. Vague pillars produce a vague feed.
They also shape what your weekly brief counts as relevant, and what a Routine treats as your subject when you ask for ideas.
Writing good ones
A pillar is narrower than a category and broader than a topic.
Fitness is too broad to match anything usefully. How to squat is too narrow to fill a pillar. Training around a full-time job is a pillar, because it excludes things and a video either fits it or does not.
Under each pillar, add the topics you actually cover. Those do the matching work.
Shares
Each pillar carries a share of your posts, and the shares add up to 100, so moving one rebalances the others. Set them to reflect what you actually post rather than what you intend to post, because that is what makes the ideas in chat match your real mix.
Keep at least one
The product will stop you removing the last one. Without any pillar there is nothing to build a feed from.
Content pillars and core ideas are different
A pillar is what you talk about. A core idea is what you believe about it.
Training around a full-time job is a pillar. Consistency beats intensity for anyone with a job is a core idea. Core ideas have no section of their own in Brain. The ones you had before Brain now sit at the end of Positioning, on the Profile page.