Chromatic exercises are the best tools to develop speed, strength and accuracy in your fingers. They might not be a lot of fun and actually kind of boring, but trust me, if you spend about 15 minutes practicing to a metronome everyday, you'll thank yourself in the long run. They are super beneficial. Anyway below is a very basic form of chromatics that you can get your hands dirty with, start at the first fret go all the way up to the first string and then slid with your pinky and come all the way up, and the continue up the fret all the way to the 21st fret, or however many frets your guitar has, just make sure you cover all the frets, and practice to a metronome.