Short answer
Posts are not a confirmed direct ranking factor, but they affect rankings indirectly and they clearly affect whether people choose you. Google has never named posts as a ranking signal. What posting does is keep the profile active, add relevant words to it, and give a searcher a reason to call you rather than the next result.
Google names relevance, distance and prominence as what determines local ranking. Posts are not on that list.
So anyone telling you that posting weekly will lift you into the top three is overstating it. If posting were the lever, ranking would be a lot easier than it is.
Worth posting: recent work, seasonal offers, answers to questions you get asked constantly, service updates.
Not worth posting: motivational quotes, generic holiday graphics, anything unrelated to what you sell. It fills the feed without helping either goal.
Roughly weekly is enough. Consistency beats volume, and four posts a month for a year does far more than twenty posts in one week and then silence.
If your time is limited, categories, services and reviews all outrank posting for impact. Get those right first.
Posting is maintenance. It keeps a good profile healthy. It is not the thing that moves you from page two to the top three.
Most post types stop displaying after about seven days, which is why a weekly rhythm works well. Event and offer posts run to their end date instead.
Write naturally about the actual work. Keyword stuffing reads badly to the customer, and the customer is the one who decides whether to call, which defeats the point.
Yes. Show a job you finished, or answer a question you are asked every week. Useful beats promotional, and it gives you something to say without inventing a discount.
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