Email Marketing: A Beginner's Guide - Master email marketing with these 3 short ebooks from Drip.
Marketing Examples - A gallery of real world marketing case studies. Updated every day.
HubSpot Free Email Marketing - Powerful drag and drop email marketing in the HubSpot CRM
Kickstart Side Hustle Newsletter - Dwarf-size newsletter with viral marketing case studies
Google Sheets Email Marketing - Email automation and validations directly from Google Sheets
Growth.Design Case Studies - Product tips… in a comic book format