On macOS, netstat is a BSD-based tool that is still fully supported. It is great for seeing open connections, routing tables, and interface stats. When you want to see which process owns a connection or port, lsof is the tool to use.

When you want to check how your Mac’s disk and CPU are doing, or peek at memory and swap activity, the commands iostat and vm_stat come in super handy. Both are built-in and give you quick snapshots of system performance.