If you press the F9 (Toggle Breakpoint) with the selected line you place a breakpoint, pressing F9 again you take the breakpoint.
Shortcuts if you hit the breakpoint:
F10: to go jumping line by line by high (Step Over)
F11: to jump and analyze within the code (Step Into)
F5: to jump to the next breakpoint (Continue)
CTRL+ALT+B: opens the window that shows the breakpoints, is useful for navigation and to clear breakpoints that you are not analyzing anymore
You already know the code workflow?
If not, you’ll have to understand, go at least once through all the steps and putting breakpoints where you want to analyze. When I debug and have a for for example, I put a breakpoint closer to the future point where I want to analyze and give continue (F5) then you jump from breakpoint to breakpoint and avoid being surrounded in a loop that depending on the size of the list, it would take a good time.
Extra:
You can also filter your breakpoints through conditions by checking the values of the variables according to your need.