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systems
basics	principles, math, numbers, tools
operating systems	6.828 (notes, linker-loader, xv6-note), linux-kernel, virtualization
distributed-systems	6.824 (notes), networks (tcp), security, blockchain
concurrent-systems	sched, coroutines (qt), parallel, performance, workflow
embedded-systems	xtensa, arm, embedded-linux, platforms, maker (beacon, modpy)
soc-design	digital-systems , systemc, tlm, uvm, systemverilog, deepchip
languages	go, python, lua, erlang/otp/elixir, scala/akka, javascript/node.js, smlnj/cps
etc	machine-learning, llvm, cuda, libffi, statistics
finance
econ, stats	nyfed (us-econ), fred (m2sl, t10y2y, t10y3m), bok, fed-funds-rate (us-yield)
investing, taxes	stocks (options, quant), bonds, forex, commodities, real-estate, retirement
life
🎲 health	music, movies, art, books, travel (earth), languages, photo, scale, wish. business