That link is mostly web based stuff. Although u could learn Javascript for Unity as well. If I remember correctly, Unity supports C# and Javascript.
https://www.youtube.com/playlist?list=PLGLfVvz_LVvRX6xK1oi0reKci6ignjdSa If you like watching things that one might be OK. It starts at the very beginning but (usually) doesn't linger too long on one subject. So depending on your previous experience or learning capabilities it might be frustratingly slow or frustratingly fast. Great stuff.