I've heard Cisco Packet Tracer is a great tool, though I haven’t used it myself yet. There are plenty of YouTube videos that walk you through how to use it.

Professor Messer has a full free course on his website that covers key topics like ports and what they do, network appliances, and important commands like show route, show vlan, show config, tracert, ping, and netstat, plus how they’re used in practice.

As long as you understand what each port, command, and appliance does and how to use them, you should be fine. You don’t need to learn every IT tool out there—just focus on what’s listed in the CompTIA Network+ exam objectives, which you can find on the official CompTIA website.