There are lots of Minecraft learning tools. Here are the top 4 best ones:
Minecraft Wiki - Wikia
The Minecraft Wikia Wiki is a great learning tool that teaches more than Mojang can about Minecraft. Personally Principal Clover's favorite.
http://minecraft.wikia.com
Minecraft Wiki - Gamepedia
The Minecraft Gamepedia Wiki also teaches a lot about Minecraft.
http://minecraft.gamepedia.com
IBXTOYCAT'S YouTube Channel
IBXTOYCAT is an awesome YouTuber who explains a lot of complex things in Minecraft. Personally Principal Clover's second favorite.
https://www.youtube.com
BIGBST4TZ2'S YouTube Channel
BIGBST4TZ2 is another great YouTuber who also does Top 5's, etc.
https://www.youtube.com