BYQ AI tokens pay for anything the AI makes for you in BYQ: the AI section builder, Remix with AI, and the AI in the Website Builder. The bigger the job, the more tokens it uses.
Everything you do yourself is free, including the Style panel, Pages, CMS edits and copying sections. AI tokens are not the same as template credits: credits unlock templates, tokens pay for AI. See What uses tokens, and what is free for how they behave while you build.