Try "Practical x64 Assembly and C++":

- http://www.whatsacreel.net76.net/asmtutes.html

- https://www.youtube.com/playlist?list=PL0C5C980A28FEE68D

Covers x86-64, MMX, SSE2/3/4, AVX.

The author, Chris Rose, has also written a free e-book: "Assembly Language Succinctly" -- (PDF) https://www.syncfusion.com/Content/downloads/ebook/Assembly_...

HTH!