Logos are for great for branding. A logo can say a lot so it shouldn't be chosen lightly.
You must make sure the logo conveys the message you want it to convey.

If you aren't sure whether you want a logo then I think you shouldn't have one. I wouldn't get a logo just for the sake of having one. Once you've chosen the message you want to convey THEN get the logo to match that message.

Just my opinion.

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Shari Sultana
Online Business Manager (marketing for retail ecommerce)