And you know what, I'd be so bold as to say that a lot of witches need to learn how to advertise ethically and effectively! Even folks whose services are 100% legit and genuine can be (or come off as) extremely shady. It's a problem! You don't have to be an expert or anything, but understanding what makes a good product listing and how to ethically advertise your goods and services is absolutely critical.
Having done marketing and advertising work for a Major Company with Many Advertising Regulations, these are the extremely basic hallmarks I look for in a good advertisement or product/service listing:
Language is clear and concise, focusing on the specific product or service in question *
Language is engaging but not inflammatory **
No typos, misspellings, or grammatical mistakes
All products and services are clearly described, and the consumer knows exactly what they would receive if they were to purchase from you
If applicable or possible, at least one quality photo of the product is provided (more than one from multiple angles is preferred, but one very good photo is sometimes enough)
Provided images appear legitimate (not AI, not stolen from the internet, etc.) and product descriptions appear to have been written by a real person ***
Prices are clearly stated and appear fair when compared to other sellers offering similar products and services, or which are otherwise explained (for example, if prices are unusually high, it may be because the seller only has limited stock or is providing a unique, high-effort service; this should be clearly stated in the listing in a simple, matter-of-fact tone)
The method of delivery is clearly described, including delivery timelines and whether tracking will be provided
If not provided elsewhere, or if it's a long list of available products/services, contact information and instructions are provided somewhere obvious and easy to access for questions and concerns
Disclaimers are clearly marked, and the consumer's rights are clearly explained (for example, if it's a commission for a custom spell, could the consumer publish the spell instructions on their blog, or is it for private use only?)
The refund policy is clearly described either in the listing itself, in the sales terms, or elsewhere on the page (so long as it's easily found)
It isn't explicitly about listings, but one other big thing I look for is whether the seller has a presence other than their shop or marketing space(s). This could be social media, a physical location, or a personal website. Basically, I want to see that they're obviously a real person doing real work in the field they're selling in, not just a grifter cashing in on what's popular.
I wouldn't buy cakes from someone who isn't obviously making cakes. Why the hell would I buy a tarot reading from someone who, as far as I can tell, has never done a tarot reading except in closed DMs when paid to do so?
* If you're advertising a specific product or service, the post, listing, or whatever else should be focused ENTIRELY on that specific product or service. Avoid extolling your virtues in excess.
What I mean is, your listing should not be 65% sucking your own dick about how long you've been doing the thing you're doing and how great you are. It should be about the product or service, not you. The place for that (and it does have a place, imo) is in a masterpost of services, a pinned post about yourself on your blog, and/or in the "about" section on your website/sales page.
** I mean inflammatory in the way of pushing the reader into a heightened state of emotion. These listings are purposefully manipulative, intending to take advantage of particular types of people. It's not an uncommon tactic, but it is a pretty scummy one, especially in spiritual circles, which attract non-experts who are desperate for relief, comfort, and results. Consider this example:
A listing for a tarot reading about future love saying, "Discover the future of your love life!" would be generally fine. A listing saying "Your love life DEFINED!! Once in a lifetime LOVE!!! SOULMATE CONNECTION? Is HE the ONE? Don't be fooled by NARCISSIST SOCIOPATHS!!" is inflammatory, intent on targeting a specific type of person who is likely to fall for the urgency and the particular language used here. You see the difference, no?
*** There are always cases of folks who aren't so good at words or taking pictures or who aren't using their first language and so forth, and it's important to take that into consideration. But for the most part, even those cases stand out from the bullshit artists, whose only goal is to take your money and run.