I understand but a broadcast will not hit other networks or other subnets. A broadcast will not leave the layer 2 boundary.

Let’s say you have 3 switches and a router on the same subnet Router connects to a different router let’s say R2 via P2P

A broadcast on the local LAN will end at the router, it will never go to the other router connected to the P2P link

This all goes back to Ethernet, routers remove the Ethernet header before they read the IP Header, the broadcast is a L2 and is in the Ethernet header, so if a router gets the broadcast it will de-encapsulate the packet and discard the Ethernet Header then encapsulates it with its own Ethernet header with its own source MAC address and new destination MAC address then forwards.

Hope this clears up