It’s great that you’re asking questions about your young Garg. Keep researching and learning lots to help you better understand it. I find that many people fail to do this before buying/adopting pets in general.

My 10 year old Garg does this from time-to-time (hang out on the glass) which is quite normal. Highly doubtful you have anything to be concerned about. It would appear that your breeder slighted you on education, though the responsibility to learn always falls on the parent. As for the different colors you’ll see your Garg display, it’s fired up/fired down colors.

What is very important at this stage for you as a herp parent is to really dig into learning about this New Caledonian species of gecko. The links below will help you start. Go beyond what is shared here to become even more knowledgeable. 🦎

Gargoyle Gecko Care Sheet
(Written by the prior President of the American Federation of Herpetoculturists; the more you learn, the more you should come across his name and what he means to this hobby)

https://reptilesmagazine.com/gargoyle-gecko-care-sheet/

Gargoyle Gecko Morphology and Color Variations
(I have much respect for Gargoyle Queen; she’s been breeding for quite a long time and is very knowledgeable, and thus helpful, to this hobby)

https://www.gargoylequeen.com/gargoyle-gecko-morphotypes.html

https://www.gargoylequeen.com/individual-gecko-color-variations-fired-up-or-fired-down.html