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by FilterSweep 3770 days ago
Perhaps start here:

https://www.nngroup.com/articles/overuse-of-overlays/

Then ux.stackexchange.com will undoubtedly have some useful pointers as well....

Although some tailored google searches will also help.

Back in my UX-only days, I used NN Group a lot in supplementing my own A/B testing - it was a bittersweet relationship, as they provide a suite of analytics-based trackers on many of the websites I visit.