All of the above!
When I started, I was a totally lost puppy: not very computer savvy, had no no no clue re photos, seo, tags, titles, no clue about anything!!!! Only had determination and love of vintage.
So much help on these forums I cannot specifically say one thing. Perhaps learning how searches work:
Etsy looks at titles and tags
Google looks at titles and descriptions. I think Crochetgal taught me that, plus much more.
I soo appreciate other sellers helping - thank you all!