Text (Ebooks, Documents)
Audio (Podcasts, Audiobooks)
Software/Apps/Tools (Webapps, Calculators, even Excel Sheets)
Video (Courses)
Knowledge/Information (Reports, Data, Case Studies)
Templates (Checklists, Design Templates, Workflow Templates, Cheatsheets)
Memberships (Communities, Access, Continuity)
Referrals (Affiliates, Sponsorships, Endorsements)