You can add what watermark you wish as long is not violating YouTube policy.
There are a lot of videos with website watermark on YT.
But i think is better to watermark your videos with your YT channel name / logo
Anyway, forget about affiliate links in description and you will be safe.
To be more correct, it depends what you want to put in your description, what affiliate links.
Still, my go will be with a website as a bridge between YT and shop for multiple reasons.
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