some of the articulation techniques that are used commonly are called hammer ons and pull offs.
A hammer on is executed exactly the way it sounds. you strike a note, and the left hand finger hammers on to the string without the string being picked again with the right hand. so if you were to play the open low E-string and you could hammer on by bringing the middle finger down to the third fret of the 6 string to sound the next note in the E minor pentatonic for G. thats a Hammer On. so any time you pick a note and bring the fretting finger down, to sound the next note, thats a hammer on.
TO DO - play the E minor pentatonic scale(or any) ascending with Hammer Ons. and if you wanna do it backwards, you're gonna use pull offs.
A pull off is just the opposite of a hammer on. you pick a note that is fretted and in our case(the E minor pentatonic scale), we are gonna pull off from an open string which is gonna sound the open high e-string.
TO DO - play the E-minor pentatonic scale descending executed with pull offs.
a lot of times, guitarists will use this technique to play fast licks. it allows you to play quickly and also gives you a smooth sound.