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systems
basics	principles, numbers , tools
operating systems	6.828 (notes, linker-loader, xv6-note), linux kernel, virtualization
distributed systems	6.824 (notes), networks (tcp), security, platforms, blockchain
concurrent systems	sched, coroutines (qt), parallel, performance, workflow
embedded systems	xtensa, arm, embedded linux, iot platforms. maker, modpy/modgo (todo, mv)
soc design	digital systems , systemc, tlm, uvm, systemverilog
languages	go, python, lua, erlang/otp/elixir, scala/akka, javaScript/node.js, smlnj/cps
etc	machine learning, llvm, cuda, libffi
finance
stocks, options	wsj, nyt, barrons, morningstar, dart, krx
bonds	us-yield, us-inflation, t10y3m
commodities	reuters, rici
quant	eikon, fnguide,cyboplus (wiki), yfinance
econ	nyfed (us-econ), fred, bok, kosis
etc	real-estate