"How to be a Witness" Acts 1:8

Wintness according to Strong's definition:

G3144
μάρτυς
martus
mar'-toos
Of uncertain affinity; a witness (literally [judicially] or figuratively [generally]); by analogy a "martyr": - martyr, record, witness.

Pastor Joe Focht has some excellent teachings on audio. Acts 1:8 is an especially good one, I think. You can listen to it HERE