Online marketing for ecommerce.
Besides your own website , there are many places and ways to get sales. Here is a list or ecommerce sites , most of which you can sign up for to place your products into their systems.. Some take a small percentage, some are monthly fee sturctured and some chsarge per item .
32Auctions
AliExpress
Amazon
Apple
Bonanza
Collector dash
Discogs
eBay
eCRATER
Etsy
Facebook Marketplace
Farfetch
Goat.com
Google
Grailed
Greentoe
Groupon
Heroine
Instagram
iOffer
Jane.com
Kixify
Letgo
Mercari.com
Newegg
Offerup
Overstock
Poshmark
Rakuten
Ravelry
Reverb
Sobump
Swappa
Thebreakersleague
thredUP
Walmart Marketplaces
Webuyblack
Wish
Other places to sell products are craigslist, letgo etc. but these need local addresses to be effective.
For all products, you need great descriptions, photos and today even videos.