The single most useful thing to understand about Pinterest is that people arrive with intent. They are planning a kitchen, a wedding, a trip or a dinner. That makes Pinterest closer to a search engine than to a feed, and it changes every tagging decision.
Describe, do not trend
On Instagram a tag can be cultural shorthand. On Pinterest it should be a plain description of what is in the image. #smallgalleykitchen beats #kitchengoals, every time, because the first is something a person types when they have a small galley kitchen.
Around eight tags
Pinterest permits twenty and around eight is the sweet spot. Because they function as keywords, more of them genuinely helps up to a point — but eight specific descriptions cover more query space than twenty overlapping ones.
Where the keywords really live
Tags are only part of Pinterest's understanding. The pin title, the pin description, the board name, the board description and the text visible in the image itself all feed it. A pin with a vague title and perfect tags will lose to a pin with a descriptive title and decent tags.
Write the title as a phrase someone would search. Write the description as two or three real sentences containing the natural vocabulary of the topic. Then add tags for the query variations the title could not fit.
Seasonality is extreme
Pinterest planning behaviour runs months ahead of the event. Wedding searches peak in winter for summer weddings. Christmas content starts moving in September. Publishing seasonal content forty-five to sixty days before the season is standard practice here and it genuinely works.
Boards are structure
A well-named board is a categorisation signal for every pin inside it. "Small Space Kitchen Ideas" tells Pinterest something useful about all fifty pins; "My Stuff" tells it nothing. Board organisation does more for distribution on this platform than tag tuning does.
The long tail is the point
Pins have a working life measured in months and sometimes years — far longer than posts on any other platform. That makes precise, evergreen tagging unusually worthwhile, because a pin you tag well today is still being found next spring.