No.
It will only modifiy the game. If it's not written well it may also crash the computer but that would be rare.
If you don't follow the directions of the mod maker then it could crash minecraft. Or the mod may not be compatible with any other mods you may have downloaded and it will do the same.
No, they shouldn't, unless they have a virus.
No, mods for Minecraft are completely free. However, they do have the potential to cause harm to your computer.
Unplug your hard drive and put it in your computer and get mods for minecraft
No.
Yes, you can download and install mods on the PC version of Minecraft, there are several gun mods you can apply.
you can get minecraft mods and textures off the minecraft mods website.
Minecraft doesn't physically harm your computer despite requiring lots of resources to run
Yes, Minecraft mods are free. However, they can be harmful to your game and your computer and Mojang cannot do anything about it since they did not make the mod.
you can always go for a alienware computer as they are designed for gaming
Have you tried to download mods? If so, some mods aren't really mods, they're scams and they hack your computer so minecraft and other programs on your computer won't work. If you usually don't shut off your computer every day, then shut it off and try playing Minecraft in-browser again.
If your taking about minecraft "Forge mod loader" than no. the only thing it does is let you install mods quickly and efficiently.
No, Minecraft shouldn't harm your computer, that is if you have a good computer with good FPS if not then minecraft will run slow. In other words you may have gotten it from a different website which may have a virus or in worst cases harm your computer. Make sure to download it from minecraft.net for no virus which could harm your computer.
you need the pc version on the computer