Communication devices:

Watch the videos on Communication devices (youtube.com)
 

https://www.youtube.com/watch?v=SvIrLC7bCjQ

https://www.youtube.com/watch?v=T6TOq4APDKo

https://www.youtube.com/watch?v=-LO3hCjT50U

https://www.youtube.com/watch?v=7xnNRQjmTMg

https://www.youtube.com/watch?v=QnCBCQa-2XU

https://www.youtube.com/watch?v=IpHLPDmebWE

https://www.youtube.com/watch?v=q6u0AVn-NUM

IT trends

Watch the videos on IT trends  (youtube.com)

https://www.youtube.com/watch?v=bMIxTAlZ8PQ  (IoT)
https://www.youtube.com/watch?v=KjnfOhCbCr4 
https://www.youtube.com/watch?v=vbNHCn2gHQ4

Operating system

Watch the videos on Operating system (youtube.com)

https://www.youtube.com/watch?v=5AjReRMoG3Y

https://www.youtube.com/watch?v=pVzRTmdd9j0
https://www.youtube.com/watch?v=DVUvcJDMQzA

Embedded system

Watch the videos on Embedded system (youtube.com)

https://www.youtube.com/watch?v=y70V0qHAFNQ

https://www.youtube.com/watch?v=tj3GmD2cXHw

https://www.youtube.com/watch?v=dS58AfaOAxk

https://www.youtube.com/watch?v=bKBpp_-reiw

https://www.youtube.com/watch?v=67BpV6Ydw80

https://www.youtube.com/watch?v=hCwmdhFac3s

https://www.youtube.com/watch?v=tj3GmD2cXHw

https://www.youtube.com/watch?v=i-rlHD1Jwmw