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/24 is a 256 host subnet, so you can have 1-254 (0 and 255 are special) in the last "octet" (each section of an IP address is denoted as an octet).

You can play with the numbers here [0] to see valid combos, like this: 192.1.254.19/24 (or use a 255.255.255.0 subnet mask)

0 - https://www.calculator.net/ip-subnet-calculator.html?cclass=...

No, 192.0.0.0/24 and 192.0.2.0/24 are completely separate networks.

See "Classless Inter-Domain Routing" [0] (a.k.a. "CIDR")

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[0]: https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing

/24 means that the first 24 bits are the subnetwork mask, ie: xxxxxxxx.xxxxxxxx.xxxxxxxx.NNN, where the x represent the network and the N represent hosts on said network.

192.168.1.x/24 and 192.168.2.x/24 are two separate networks.