Family acoustic guitar put the beginning of familiarity with the fretboard.
Grew up on Deep Purple, W.A.S.P., up to certain of their albums, Iron Maiden, Judas Priest - the reference of metal in the department of weights and measures with the crowning of their works - the Painkiller album.
I played for many years just for myself.
In a serious way, the situation was transformed by Vladimir (Valde) Tronov with the phrase:"I want to play cruel true metal with you and bring this darkness to the masses!" And sick shit rushed as it is.