Even if im a midlaner , i ll like to learn how 2 track

Are you asking how to track the enemy jungler, the enemy mid-laner roaming or something else entirely?

... what do you mean track?

If u mean the jungler :

• look at where's the jungler start
• then look at his cs number and use ur brain to deduce which camp he cleared
• u can fast push earlier and put a litte ward around his burdy
• after ur first back buy put this in the river bush (the one in the "middle" of the river). And play around this side.
• put a simple the other side
• at lv9 (put one near of ennemy wolf camp)

Globaly u track him in deducing wich camp he did and will clear, and with a good warding. Take in accound his mobility, and cc of his mate. But depending on the elo rotation of jungler are more random (its more logical when u climb).