The list of the YT videos below has helped me in my career for some time. Good tutorial videos such as these are really a gem for IT knowledge seekers like me. Hope these help you too in any way.

Hardware

Some Trouble Shooting

Networking

Computer Networks: Essentials and How They Work

I personally find this playlist about Computer Networks really helpful. The training is well done and clear to understand. Kudos to a fellow Indian who uploaded this.

The Internet