Reddit reviews Effective Coding with VHDL: Principles and Best Practice (The MIT Press)

there's the book effective coding with vhdl.

https://www.amazon.com/Effective-Coding-VHDL-Principles-Practice/dp/0262034220

i haven't gone through it and am just learning the xilinx toolchain and vhdl myself, but it is on my own radar.

IMO, the best book on VHDL is this one:

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https://www.amazon.com/Effective-Coding-VHDL-Principles-Practice/dp/0262034220/ref=sr_1_fkmrnull_2?keywords=vhdl+best+practices&qid=1557767187&s=gateway&sr=8-2-fkmrnull

EDA Playground (simulate VHDL/Verilog online)
https://www.edaplayground.com/
Check youtube for usage tutorials.

Vendor Materials for General VHDL/VERILOG & FPGA Concepts
Altera Intel https://www.altera.com/support/training/university/materials.html
Xilinx https://www.xilinx.com/support/university/vivado/vivado-teaching-material/hdl-design.html

Past Recommendations
https://www.reddit.com/r/ECE/comments/50tlkl/fpga_bookresource_reccomendations/d7c08i8/
https://www.reddit.com/r/ECE/comments/451e7z/can_fpga_be_self_taught/czusnlc/

I recently picked up two books to refresh my VHDL knowledge. The first one appears to give a good introductory rundown.
https://www.amazon.com/Circuit-Design-Simulation-VHDL-Press/dp/0262014335/
https://www.amazon.com/Effective-Coding-VHDL-Principles-Practice/dp/0262034220/