A set of notes and perhaps lessons on using tools that are frequently used in cybersecurity.
Learn basic Networking at TryHackme.com room IntroToNetworking - Learn how to use basic tools likely already installed on every computer: ping, tracert/traceroute, whois, and dig. Covered in Network+, Security+, CySA+.
Using TCPDump - A command line tool for capturing network packets for later analysis. Wireshark is a graphical implementation of tcpdump. Covered in Network+, Security+, CySA+, and SSCP.
Cyberchef - A great tool for deobfuscating code, de-coding shellcode, and other data conversions.