Before clicking a single IP field, let's internalize the fundamentals.
NetPractice is a foundational networking project in the 42 curriculum (Rank 04) that focuses on the mechanics of TCP/IP addressing and network configuration. Unlike most 42 projects, it does not require writing code; instead, you solve 10 interactive levels by troubleshooting and reconfiguring non-functioning network diagrams in a web-based simulator. Core Project Goals netpractice 42 tutorial
The Internet router does NOT have routes back to your private LAN unless you add them. But in NetPractice, the Internet router is often fixed. So you must configure your router to use NAT (not configurable in NetPractice – instead, you rely on proper routing and the fact that the Internet router may already have a route to your network). If not, you add a static route. Before clicking a single IP field, let's internalize
ipcalc 192.168.1.0/24