What should I do with reuseport in linux?

What should we do with reuseport in linux-general Linux technology-Linux programming and kernel information? The following is a detailed description. This chapter describes the set of interface options, including basic options, IPv4, IPv6, and TCP options. Then there are some functions, such as getsockopt, setsockopt, and fcntl. Of course, ioctl is also mentioned.

I have almost never touched on these options before, and I have not had a deep understanding of them. I have also introduced them clearly in the book. Below I just paste the options supported under Linux and Their default values, for your reference. (Note: I followed the example in the book and added several more options)

Basic set Interface Options
SO_BROADCAST: default = off
SO_DEBUG: default = off
SO_DONTROUTE: default = off
SO_ERROR: default = 0
SO_KEEPALIVE: default = off
SO_LINGER: default = l_onoff = 0, l_linger = 0
SO_OOBINLINE: default = off
SO_RCVBUF: Defaults = 87380
SO_SNDBUF: default = 16384
SO_RCVLOWAT: default = 1
SO_SNDLOWAT: default = 1
SO_RCVTIMEO: default = 0 sec, 0 usec
SO_SNDTIMEO: default = 0 sec, 0 usec
SO_REUSEADDR: default = off
SO_REUSEPORT: (undefined)
SO_TYPE: default = 1
SO_USELOOPBACK: (undefined)

// IPv4 Option
IP_HDRINCL: default = off
IP_RECVDSTADDR: (undefined)
IP_RECVIF: (undefined)
IP_TOS: default = 0
IP_TTL: default = 64
// TCP options
TCP_KEEPALIVE: (undefined)
TCP_MAXRT: (undefined)
TCP_MAXSEG: default = 536
TCP_NODELAY: default = off

Note: undefined is not supported.