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There seems to be plenty of different methods from me looking it up but here's someone's take on how to do it:

"A good way I've found to W-Tap is by switching your sprint key to R, then holding W in PVP. Spam R while hitting them. You won't lose your sprint because you're constantly running. As long as you keep your distance, they will have a hard time hitting back. If your getting W-Tapped on, I've found that using a fishing rod is useful, but I'm not all that good at Rod PVP." hypixel.net/threads/question-about-w-tapping.2342032/post-16684904

" Resetting your sprint. Resetting sprint means that each of your hits can deal more knockback, some people think that spamming it like clicking attack is how you do it, but the best way I find is to hit your opponent, let go of W for just enough time for their knockback to register, then press it again as SOON as they start moving backwards. This means they can't hit you as you create just enough space to stay outside of their hit range. A quick blockhit (not constant) can have the same effect if timed correctly." hypixel.net/threads/what-is-w-tapping.1246798/post-10234085