Do-follow and no-follow confuse almost everybody who hears the terms, and the clearest post here settles it. Both send a reader to the same place when clicked. Only one passes any credit to the destination, and knowing which is which changes where you spend your commenting time.
That is the practical heart of a blog about building a network marketing business online. Comment where the traffic is real, check the standing of a page before you write anything on it, and treat the exchange as useful to both sides rather than as something you are taking.
The beginner series lays out five fundamentals, starting with a blog that has to carry actual information rather than a pitch, and an opt-in form that is not an afterthought.
There is a post on communicating well as the thing that decides whether any of this lasts, and one on why most businesses fail.
Read the backlink explainer first. It takes ten minutes and stops you wasting months.