Redownload it. That's the only way to fix it.
if you haven't changed your controls, its 'E'.
By default, your minecraft port number is 25565, unless you've changed it this is your port number.
There is a version of Minecraft that you can download and play without an account called MinecraftSP It's exactly the same as Minecraft and can be updated, modded and have it's texture pack changed, but you can only play single player To play multiplayer, and be able to change your skin, you need to buy the game Creative mode, monster spawner eggs and villagers are all part of Minecraft
Minecraft was first called 'Cave Game'. It was then changed to 'Minecraft: Order of the Stone' but to avoid it being confused with 'Order of the Stick' it was simplified to Minecraft.
because the updates completly changed minecraft so the world is broken
Yes.
The crafting recipe for books in minecraft was first changed in version 1.3.1. It is now crafted with 3 Paper; 1 Leather.
Yes, it will, but not all of them. Some features may be changed, or removed. You can tell which features are new, removed, or changed in the Minecraft launcher, because each feature will have a +, -, or an * next to it.
If it lags to much, you need to download the newest version of Java Runtime Environment, then set it back to far. It should stop lagging
Yes, the mode can be changed.
You changed the texture pack?
NO. You only pay it once. The server is even free to download and use. The maker even said he would only charge again if he did a complete rewrite of the game and changed a substantial amount of content.