The Legend of Zelda: Breath of the Wild

• Need to pass time waiting for something? Drop a pile of Wood and a piece of Flint on the ground, and slash it with a metal-bladed weapon. Instant Campfire!
• Take the Old Man's advice and head on to Kakariko Village before doing anything else. You'll run into some upgrade systems for improving your inventory space, and the Shrine in the middle of the Duelling Peaks will give you a bandanna that improves your climbing speed.
• Go to Hateno Village ASAP as well, because you can upgrade your Runes at a place there in exchange for Ancient Parts.
• If you want a good horse right off the bat, follow the road west to the stables just NW of the Great Plateau (the big building with a giant horse head on the roof). Do the sidequest there, and bring a shitload of Stamina potions with you.
• Don't wear metal in a thunderstorm. Take it off or take a bolt to the head. If you see flickers of lightning around Link, you've got metal on.
• Yes, you can probably do that crazy thing you're thinking of to that hapless Moblin/Lizalfos/Wizrobe. Try it.
• You can't buy weapons or shields, you can only loot them off the ground or find them in chests.
• Drop your first upgrade into a Stamina boost rather than a heart, it'll help with getting around early on.
• Diamonds are useful and shouldn't be sold, any other kind of gem is fair game. Keep nine Luminous Stones on you for when you go to Gerudo Town. You'll know why when you find the store.