chord progressions

Hello everyone, I start again to dive into music theory after a few years of studies without playing music. In a direct prolongation of my Eternal Beginner syndrome, I found out that I forgot everything and should start from scratch! I follow this tutorial to understand how to follow a chord...

Hello all, It shouldn't be, but my music theory is a bit flaky, so hoping my betters here can confirm or expand on this... I think I've been a bit duped by a questionable (and in some cases plain wrong) "bass theory" poster I bought online. I've seen a few different iterations of it online...