Defining your content pillars really helps you stay focused and keeps you creating around a specific subject. They help you not run out of ideas, they provide clarity for your audience ie this is what this brand/person makes and also makes it way easier for the algorithms to understand what you are creating and then serve it to your people.
Example:
Beauty Blogger -
Content Pillars -
Educational content (how to apply makeup, beauty related tutorials)
Reviews - Honest reviews of products building audience trust, product testing
Industry content - News and updates in the industry, product hauls etc
Social content - Behind the scenes, get ready with me, come with me, unboxings, real life related beauty chats, relatability
The beauty blogger can create around these subjects and not wonder what should I be recording today. Theres always something to pick from their content pillars. Sticking to posting around 3 to 5 content pillars allows people to better understand who you are, what you make and what to expect at your channel.
To begin with make sure you choose your niche, identify your target audience, build a list of content ideas, from the ideas create groups of similar ideas and then narrow them down into pillars like above.
What are your content pillars?