Like all things SEO, there are best practices to always follow when creating a pillar piece:
A pillar piece should be 2,000 words long or more
Include a TLDR (Too Long, Didn't Read) section that links to your most important sections
Break your SEO topic clusters into chapters or a section that covers a main idea
Include buttons or quick links that let readers jump from chapter to chapter
Implement strategic backlinking and consistent anchor text for keywords you'd like your blogs to rank for
Encourage your readers to click around to your other resources to learn more about specific topics and increase pages per session