Sure, F13 deals with miscellaneous concerns that may affect the capacity of some flexural members.
F13.1 addresses our assumption that the tension flange of a flexural member will yield (and usually after we've reached a limit state on the compression flange, especially for doubly symmetric members). This is usually true, however for tension flanges with lots of holes, tensile rupture may be the governing failure mode, just like if your flexural member was really a truss with a tension chord.
F13.2 provides some general proportions for flexural members that makes sure the analysis methods and limit states prescribed elsewhere in Chapter F are applicable.
F13.3 provides guidance for beams with cover plates, specifically about the required development of those plates (the difference between physical length and theoretical length).
F13.4 Talks about the need to consider the connection between two beams which are joined and assumed to act compositely. (This section is unfortunately worded, IMO)
F13.5 discusses a modification to the unbraced length of a beam if you're taking advantage of moment redistribution per B3.7.