Grab/Throw Mechanic.,Grab/Throw Objects Mechanic

Hello everyone!

I am currently working on a First Person 3D game inspired by portal. You need to solve puzzles by grabbing objects (cubes) and placing them in the right spot, or using them in a right way. I am a C# beginner and i have no idea how to make a Grab/Throw script. I`ve searched it up on google, and found a script. The thing is with that script, when you pick up a certain object once, and throw it, you cannot pick it up anymore, which is bothering me. If anyone can send me a C# or Java script for a Grab/Throw mechanic, and tell me what to do to make it work right, that would be great! Thanks.

EDIT

I found a working script now , so yeahhhh...