Yes, to install it you will need modloader, and modloaderMP
As of the newest forge, no.
Use MCPatcher, it can install any mod and it works well Also, make sure you have the right version of the mod for your version of Minecraft
install forge and there will be a mod list
Use minecraft forge or modloader so that the mods are compatible.
I think you just either download something (mod) that requires forge but if the mod doesn't, download forge, drag and drop the files into the .jar of minecraft and voila! Please inform me wether this worked or not
If your taking about minecraft "Forge mod loader" than no. the only thing it does is let you install mods quickly and efficiently.
download minecraft forge, open it up and keep forge as is and hit ok, then find a mod, download the jar, and locate your minecraft folder go to mods folder, open that up and drag the mod jar into the folder and enjoy your mod. P.S. go to edit profile on minecraft launcher page and go to: use version, then scroll all the way to the bottom and click on the forge thing and then hit play and enjoy your mod.
Forge, Forge is very popular and runs several Big mods like Tekkit and The House mod. Forge is completly lag free.
It is quite possible that your are installing the mods incorrectly or attempting to install incompatible mods To avoid this use a mod installer (like MCPatcher) and install Forge Mod Loader first so all your mods work together
Yes, otherwise the mod will not work correctly.
If the portal mod is not compatible with the Mo'Creeps and weirdos mod you can install Forge API to make them compatible.
There are many tools such as Modloader and Minecraft Forge that allow different mods work together.