sometimes
Not in the current Vanilla (Minecraft without Mods) Minecraft, no. But their are a few Mods out there that will make that possible.
you can get minecraft mods and textures off the minecraft mods website.
No it might be that you have an out dated mod that crashes to game or that you do not have something like modloader (which you need for most mods). Also when downloading mods make sure they are for your current version of minecraft or it will defiantly crash.
Yes, some may affect the game and its performance. If you have a slow computer, I don't recommend that you download too many mods.
there are no mods in minecraft pe i hope there will be
Yes, most Minecraft Mods are updatable.
No, you should not use BearShare to download Minecraft mods. BearShare was originally a peer-to-peer file sharing program used for music and general files many years ago, but it is not a trusted or recommended source for Minecraft mods today. Minecraft mods should always be downloaded from safe and updated sources, because unofficial or old file-sharing tools can expose your device to: Outdated or broken mod files Malware or unwanted software Compatibility issues with Minecraft versions Instead of using outdated platforms like BearShare, it is better to follow a proper installation guide that explains safe download steps and correct mod setup. If you are looking for a safe way to install Minecraft mods like Jenny Mod, make sure you use a trusted step-by-step guide that explains everything clearly from download to installation.
you can get most minecraft mods off the minecraft mods website, or you can google.
Unplug your hard drive and put it in your computer and get mods for minecraft
On Minecraft Forums
Minecraft Forge lists you all mods in minecraft and Forge
Minecraft mods are always free.