What a great goal for the new year, @Artemisia- good for you for deepening your tarot studies, I’m cheering for you! 
I haven’t read Holistic Tarot, but I second what @Christine13 said about the Biddy Tarot website- that’s an amazing resource for tarot readers online and for free! 
And if we’re talking about online/other media content, there’s also the Spells8 Tarot Course that breaks down each card and has some general lessons (such as the history of tarot)- whenever I’m learning something new I like to use multiple media formats (books, videos, physical cards, etc)- it seems to help me get new information to stick 
As part of Book Club, I read The Illustrated Key to the Tarot: The Veil of Divination by L.W. De Laurence (along with @mary25 and @judith5)- you can read our thoughts about the book in this discussion here. The book itself is available as an ebook online for free through Project Gutenberg 
I recently found myself with a copy of Tarot: a New Handbook for the Apprentice by Eileen Connolly which seems to be a commonly referenced book, but I have some mixed feelings about it. There is a wealth of great info in it, but I don’t always agree with the author’s tone (I like more gentle guidance rather than “this is the right way to do things”). I put it down and haven’t picked it up again 
One tarot book I highly recommend is Tarot: Connect with Yourself, Develop Your intuition, Live Mindfully by Tina Gong. I love her gentle and holistic approach to the Tarot- it’s been a great book so far! That being said, she takes a very Jungian point of view and her interpretations may not resonate with everyone. Also, the book is available for just 5 USD through Five Below (sorry- site is only accessible within the USA) right now- it’s a real steal of a deal! 
Good luck and wishing you all the best with your tarot studies, Kat! 
