It is essential to have a basic knowledge of music theory such as: Chords, Scales, Keys, Rhythms etc. The more you know can only make you a better bass player.
I will start with the Modes of the Major Scale, Harmonic & Melodic Minor Scales, and will dig in deeper later.
I give online bass lessons, just click on link above and book some time.
Bass player, teacher, Cape Town South Africa.