Hi!
Welcome to my Ashe guide!
Ashe is a ranged Marksman with a range at 600. She is an ADC I recently just picked up again, after a long time.
Ashe is fun ADC with a lot of utility.

Pros!
+ Easy to learn
+ Can engage with ult
+ Great utility, which synergies well with some supports
+ Perma slow with basic attacks from Frost Shot (Passive)
+ Long range (600)
+ Steroids from Q
Cons!
- No mobility

Flash for increasing your mobility and survive ganks or if getting hard engaged
Heal helps you survive heavy damage from bursts and gives you a small movement speed buff.

Against champions with Grievous Wounds, you are more likely to take barrier, since your healing is hafled

Ashe passive is really strong with her perma slow from her passive, which also adds to her basic attack critical strike damage.

Ranger's Focus increases her slow, by 20% which makes it easier chasing fleeing enemies. Passively the ability adds stacks towards Ranger's Focus active ability. When active it makes her basic attack do bonus damage and gives attack speed for a few second.
You can activate the ability before 5 stacks, but won't deal bonus damage.

Volley also recently got updated with lower cooldown at earlier levels and adds 1 stack towards Ranger's Focus. This is your primary harass ability.

Hawkshot sends a hawk out scouting in a line, giving vision in its path.
Enchanted Crystal Arrow is a global ultimate, which send out a big arrow stunning the first target hit and slowing near by enemies. Best used at long rang than short range, since the stun duration is longer, depending on how long the arrow has traveled.
NOTE: Enchanted Crystal Arrow deals magic damage.