With the explosion of amateur electronics interest there is a renewed demand for basic electronics information. I’ve found the information available at All About Circuits to be well written, up to date, and easy to follow. In addition there are a number of courses available via edX offering beginner to intermediate level courses.
Need a simple, easy way to check if a piece of Cisco hardware is covered under warranty or SMARTnet? Look no further than this useful site: https://cway.cisco.com/sncheck
You will need to login using your Cisco.com (CCO) username and password, but then you can check on coverage for ANY serial number. If the serial number is covered under a contract associated with your CCO account then you will see additional details including coverage end date and coverage level.