Following the EOS.IO Tic Tac Toe Tutorial for developers

The developers portal for EOS is pretty comprehensive. I ran into a few issues following their tic tac toe tutorial, which are outlined in the video.

Let me know if anything's unclear from the video. Happy to answer any questions!

Tutorial is here: https://developers.eos.io/eosio-cpp/docs/tic-tac-toe-tutorial
Tic-tac-toe smart contract code: https://github.com/EOSIO/eos/tree/release/1.1/contracts/tic_tac_toe
commands from video: https://gist.github.com/niko79542/30b3a94761f1f5c2c1b6c174ab75a2b1