A LAN can be 192.168.x.y
Where x picks a LAN with 253 available addresses typically. The x can be any number from 0 to 255, but whatever the router is, everything else matches.
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pparently the router address was automatically changed from x.y.1.1 (for Netgear) to x.y.0.1 (for TP-Link).
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No, those are just different defaults. They are not the Public IPs, so usually can be be changed unless the ISP is stupid and locked the LAN side of the Router.
This is nothing to with Apple or getting a new Router.
Nothing to do with changing from Netgear to TP-Link, but lack of research and poor configuration of the replacement router. Plenty of web sites explain this.
I've changed ISPs many times over the last 25 years. Our LAN still uses the same IP address as when the "Router" was a PC running NT 4.0 had had an analogue modem and proxy server, ISDN, then Analogue, then ISDN over Wireless, then Analogue, then Cable DOCSIS over Wireless, then VDSL, then Cable DOCSIS over Wireless again. Fibre is available soon. It will make no difference to the LAN or WiFi settings.
We have changed Wifi settings over the last 25 years as new better encryption was added and longer passwords needed to be added. But never as a result of a new modem or router or modem-router.
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When I changed my router, I changed the SSID on the new router to the same as it was on the old router, made the security setting the same as on the old router, and everything reconnected fine.
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Yes. Though sometimes you have to also add DHCP & Static reservations on the new Router to match old, and obviously if any static IPs used, the router may need its subnet/entire IP changed.
Any servers, printers, plotters, standalone airpoint admins ideally should static, though a reserved DHCP IP coupled to a Mac address can be used except with stupid gear that by default as misbegotten privacy idea changes it's MAC address (Apple iOS?) which can only use ordinary DHCP.