Here are four different guitar riffs all in the key of C minor. The styles vary but of course they are all in the same key so could be used as a starting point for your own improvisations. You can also move the riffs up and down the guitar neck to play in different keys. For example, move everything up by one fret and you’ll be playing in C# minor. Move up two frets and you’ll be playing in D minor etc.

Have fun learning  the riffs then feel free to alter them and create your own variations. Don’t forget, the tab is there below the video.