Q&A for How to Make a Minecart in Minecraft

There are different rails, with different uses. One type is the activator rail. Its pure use is to ignite TNT mine carts. Detector rails emit a redstone pulse when a mine cart goes over them, which is very useful for traps.

Yes, the ones that make you go faster, the normal ones, red stone activators, etc.

The Xbox 360 version says age 10, but the mobile version says everyone.

Yes, but only if it is a chest minecart.

You can make a minecart with a furnace by placing a furnace and an empty minecart in a crafting table, with the furnace on top of the minecart. Furnace minecarts are exclusive to Java Edition, so this will not work in Bedrock Edition.

The powered rail, if powered by redstone, will make your minecart go faster.

A minecart with a hopper collects items nearby it with a range that's a bit bigger than the cart itself. It also is able to take items out of containers above it and pick up items through a block directly above it. Additionally, you can place tracks over other hoppers and they'll pick up the items from the minecart with a hopper.

Connecting minecarts only works in the Java edition of Minecraft. You just need to push the carts into each other and they should connect.

Yes, an active activator rail can activate TNT if it is in a minecart and goes over the rail.