I don't know anything about the Thoth deck but I was looking this page over at the link you provided above
http://tarotinstitute.com/short/really/index.html
and it just makes me sad. Talk about boxing yourself into being a caged parrot.
Keywords are nice when we begin because they let us use the cards with some semblance of confidence, they give us a tool to start with. But the cards are so much more, each one has a world of stories to give us depending on the time, draw, and need at the moment.
I haven't been using the cards all that long but I can look back and see a lot of different stages I've worked through on the way to today's understanding of the cards, and I greatly look forward to all the stages to come. Tarot is a growth subject, not a static one.
I've read every tarot book I've come across, many of them several times. I take what I need at that time and leave the rest. None of them are law, be flexible in your learning and it will come a lot easier. And you'll never be done learning so enjoy the journey, and welcome to AT...truly a great learning source in itself...and here too, take what you want and leave the rest. No one here is TarotGod although a few would be surprised to know that