How can i move my camera? I know how I can rotate but how can I move up and down or sideways? Google didnt found anything useful

I read I can do it with Ctrl + c or . but the first one just fixed the camera at a point where it made everything even worse and . just did nothing
To move objects you need to select them then press G to Grap and transform them. After pressing G you can press x or y or z to move along a certain axis.

To move the view in the 3DView, use Shift+Middle mouse button and move your mouse