Affiliate marketing is one of the oldest techniques to earn money in Digital Marketing. Basically, it is a commission-based marketing. For example, if you refer a product link to others and if anyone buys that product by clicking on your link then you will get the commission.
Community marketing is a strategy to build trust and relation between existing customers. Mostly, this is used for social media like Facebook group, WhatsApp group, group on twitter, Instagram etc. Companies follow community marketing to increase brand loyalty.
This is the most powerful tools for the marketing purpose because Google only understand content, not Images and Videos. Content marketing is used for SEO (Search Engine Optimization), Social Media Marketing, Blogging, and the ranking on Search Engine first page.