Read it. It's important going for you.

When caving, remember to leave torches or other markers behind you to find your way out!
Not every jungle has a temple in it.
If you have shears, you can cut the tripwire in a jungle temple without it being triggered
A witch cannot attack while healing, so it is helpful to get the first shot.
Lighting up the caves as you move through them also makes it more likely to find ores in the floor, ceiling, or walls.
The best way to kill a witch is with a bow. It has a longer range than the distance a witch throws potions.
Villages only spawn in flat biomes (plains, savanna, or desert)
Iron and diamond pickaxes are the best for mining redstone, it is easier if you have one.
Make sure your mine is at the top of bedrock. If it isn't, you'll have to dig around the bedrock.