New?
>http://i.imgur.com/lcI51Bc.jpg
>https://pastebin.com/XDU1wEnz

TL:DR:
>Complete all Trainer Challenges to get 45 free packs (use Cheat Engine's speedhack to speed up AI games)
>Play through using Basic decks to unlock them for versus play.
>Farm Versus Mode theme ladder for Tokens and Tournament Tickets.
>Enter tournaments to get TRADABLE chests and packs.
>DON'T OPEN THEM.
>Trade them for the cards you actually want for a deck you want to build.
>Public trade is like the GTS, if you want proper results, put up your own offers.

What themedeck should I buy?
>Buy the Lunala one.

Resources
>http://www.pokebeach.com/forums/forum/tcg-competitive-play.156/
>http://www.pokemon.com/us/play-pokemon/pokemon-events/championship-series-event-results/
>http://thecharizardlounge.com/decklists/
Looking for specific cards?
>https://pkmncards.com/advanced/

To see what your PTCGO stuff is worth, look on the forums in the trading section. Trading companies overprice cards, aim lower. Keep pack value in mind when trading.
>http://forums.pokemontcg.com/forum/33-in-game-item-exchange/
>http://www.ou7c4st.com/card-values.html
>https://docs.google.com/spreadsheets/d/1c1f_CdC_RIlzz_JMfFjBQmfZmgUXjkBlE86EzcJQOI0/edit#gid=1768215359

Code Giveaways:
>Post them as an image with the QR code covered. Bots will snatch plain text or uncovered QRs.
>Ask for emails and send em individually.
>Post your pulls or your mom dies in her sleep.

Thread question to test if anyone actually reads the OP and maybe generate some discussion:
>Feature or change to the TCGO client you'd most like to see?