Welcome to the forum @erietta! I’m Siofra_Strega from Cape Cod.
I’m happy that you have started the lessons! There is a lot of great information contained within them & the site itself has different sections relating to all kinds topics. Searching the forum is another great way to find information on topics that you may be interested in too.
Weekly Witchy CHALLENGE - Light ‘Em Up!
Flickering Magic: How to Read Candle Flames, Meanings and Interpretations
Weekly Witchy CHALLENGE- Of Candles and FlameCandle Magick using colors!
Candle Colors & Their Meanings Spells8
Witch’s Apothecary Course Spells8
I hope some of these help you get started in the forum & for further research or reading, you can check out the Book Clubs & the Reviews for them. We have quite a few Green Witches & Witches that use Candles in their magical practice as well.
Please remember when working with candles for any reason to practice: Candle Safety 
Everone here is very friendly & helpful. Please feel free to ask any questions or share any information with use. For your own information, when creating posts of a more personal nature or anything you don’t want public, please post in A Sacred Space. Only coven members that are logged into their accounts are able to view & interact with that category. 
I look forward to learning with you! 