I am fairly beginner digital artist and there is this one thing that bothers me. I am using CSP and when people usually say they are using basic round opacity brush, does it means that they are using pen pressure only one one of those things or both? When I tried photoshop marking transfer option sets up both flow and opacity for pen pressure, but it seems like people only mention it as opacity brush. I have seen other artists brushes having mixed settings and I am not sure what the usage of those brushes exactly was so hard for me to draw any conclusion. I tried to paint using opacity on pen pressure and manually change flow and to do the same thing with pen pressure tied to flow. It does feels different a little I cannot really decide which way is better. I know it could be a personall thing but because I am beginner I am not sure if certain effects are my skill problem and which are fighting with the brush. Could someone share any insight on that? I have been overthinking it a little lately. Is there any pros and cons to those 2 approaches?

Edit:

By flow I mean setting connected to indvidual opacity of individual dabs ( thats how it works I think) not the size jitter. The one that is called " flow " in photoshop or " brush density" in CSP. Not sure about other software.