ThereAreFishInThere is correct, most reels come with 2 "braking" systems.
The first one is a more "no touch" break with fingers. (Listed as Parts 91-93 in this diagram)
https://www.lews.com/images/manuals/casting/Mach1.pdf
Second brake is a "lure based" knob that puts tension on your spool (Part No 57)
Because will the knob as if it is too loose, it will fall off your reel!!!
Ideally, you want the "fingers" brake to be about half (as its not very accessible, its based off of your skill and what your primary uses for the reel are, I think the manual has a recommended setting of half- Should be 2 points up and 2 points down, some reels have more points but try and keep the points spaced evenly)
When using baitcasters its also important or a good idea to "oversize" your braid. I generally run a 50lb braid which has the equivalent of 12lb in mono.
The reason for the heavier braid is;
1) stiffer line is less likely to respool and cause birdsnests
2) When you do have a birdnest its much easier to see the "knot" and to untie
3) Extra power for controlling big fish! (from weeds or any kinds of structure)