This video addresses the common question of how to know if you've been hacked. The speakers, David Bombal and a hacker named OTW, discuss simple and intermediate methods to detect hacks, differentiating them from simple computer malfunctions or user errors. The video also features a sponsored segment for Brilliant.org.
ps aux (Linux), Task Manager/Process Explorer/Process Monitor (Windows), netstat (Windows), and Wireshark can reveal suspicious processes and network connections.