There are lots of free resources on the Internet to learn. Here I list eight legally free VHDL books. Some of the sites require registration to download the free book.<p>MicroZed Chronicles (Vol. I) – https://fpgasite.wordpress.com/2016/08/13/the-microzed-chronicles-free-fpga-book/<p>Free Range VHDL – https://fpgasite.wordpress.com/2016/07/24/free-range-vhdl-free-book/<p>Altera's FPGA for Dummies - https://fpgasite.wordpress.com/2016/03/25/fpga-for-dummies-free-book/<p>Xilinx's High Speed Serial IO - https://fpgasite.wordpress.com/2016/04/07/high-speed-serial-io-book/<p>FPGA prototyping book - https://fpgasite.wordpress.com/2016/06/23/prototypical-fpga-prototyping-free-book/<p>FPGA's now what - https://fpgasite.wordpress.com/2016/04/14/fpgas-now-what-free-book/<p>The Zynq book - https://fpgasite.wordpress.com/2016/06/28/the-zynq-book-free/<p>Introducing Spartan 3E and VHDL - https://fpgasite.wordpress.com/2016/07/09/introducing-the-spartan-3e-fpga-and-vhdl-free-book/
There's interesting material at then end of the link chains. Rather than linking to a blog that links to the relevant material, it might be better to share a single blog post with direct links...or maybe a Github repository with direct links in the Readme file.<p>Good luck.