Learn English: BY or WITH? From ----- Learn English with Emma [engVid]

by verb ing
I learned Karate by watching Youtube.

with noun
I write with a pen.

By or With ?

By
noun = person, place, thing
By = communication
         transportation
         other exceptions/examples
examples:
I will contact you by email.
I will message you by text.
I will go by bus.
I came by car.

With
noun = body parts
with = body parts
            tools
            instrument
examples:
Italians talk with their hands.
I  point with my fingers.
I cleaned the floor with a mop.
I ate dinner with a flrk.