A lot of this could come from the Fomu workshop too.

Ref Learning VHDL with GHDL (ghdl/ghdl#1291)

I've made good experience with Jupyter NB and immediate rendering of .dot images or waveforms, however it needs a bit more love (from the Python API side) for better usability.
I've added some beginner's examples to the 'hacker space' which checks out from a secondary repo when starting the binder via the button below (follow instructions)

So basically you code 'HDL' in Python, hit Run and see the output from yosys et al.

The framework also covers co-simulation and synthesis to real hardware (ECP5 FPGAs for now), that's where the focus is currently on. So not sure how well it would integrate with Symbiflow.

Here is are selected links from this list, in case that helps...

Gateware

http://zipcpu.com:
A long-winged effort for documenting a learning-path through verilog and hardware design.

http://stevenbell.me/:
Classes on digital logic circuits available online.

https://hdlbits.01xz.net/wiki/Step_one:
Exercises and learning material for Verilog.

https://projectf.io/:
FPGA info site oriented toward video.

https://www.fpga4fun.com/:
Lessons for practical approach to FPGAs.

HDL Languages

https://en.wikipedia.org/wiki/Verilog:
Used by most chip makers, and lingua frinca of the FPGA world.

https://en.wikipedia.org/wiki/VHDL:
If it is not Verilog, it is likely going to be VHDL.

https://clash-lang.org/:
Haskell-based HDL.

https://m-labs.hk/migen:
Python-based HDL.

https://www.chisel-lang.org/:
Scala-based HDL.

ASIC

Specifics of getting an ASIC built-up out of a circuit design.

https://www.youtube.com/watch?v=fIJCoViDIj0:
Introduction to VLSI manufacturing processes

https://hackaday.com/2022/03/18/the-open-source-asics-hack-chat-redefines-possible/:
Introduction to the ASIC world.

FPGA

https://f4pga.org/:
fpga toolchain for Xilinx 7-Series, Lattice iCE40, Lattice ECP5
FPGAs, QuickLogic EOS S3

https://www.sparkfun.com/news/1203:
Introduction to FPGAs by SparkFun

https://hackaday.io/project/27550-the-hobbyists-guide-to-fpgas:
Introduction to FPGAs published on HACKADAY.

https://vhdlwhiz.com/terminology/:
Definitions and learning material

https://joelw.id.au/FPGA/CheapFPGADevelopmentBoards:
Overview and advises of FPGA boards for getting started

Simulation

Simulating hardware at gate or circuit level.

https://www.isotel.eu/mixedsim/:
Tool building on top of ngspice for simulating circuits.

https://en.wikipedia.org/wiki/List_of_HDL_simulators:
Wikipedia list of HDL simulators

https://ghdl.github.io/ghdl/:
The great one tool for VHDL.

https://www.veripool.org/verilator/:
A simulator turning Verilog into C++, providing a thin C++ api to
interact with simulated hardware.

http://iverilog.icarus.com/:
Some other simulator that I should try some day!

Ah, and I forgot, for visual learners: https://redirect.invidious.io/channel/UCJaq8Bzo3J7Hq5lyfhYO3Ew

There is an ongoing effort to gather resources here: https://bit.ly/Learn_FPGA