A comment I found on Reddit on resources on Electrical, Electronics and Computer Engineering by this user u/AutumnFoxy:

https://www.reddit.com/r/ECE/comments/pi6xs4/best_websites_for_ece_students/hbodkq0?utm_source=share&utm_medium=web2x&context=3

I focus on DSP and digital communications + ARM and FPGAs, so will share the ones I liked the most!

(make sure to check online universities, some tend to share lectures online, for example - MIT)

Feel free to note me if you have any questions! Maybe I forgot some good channel, will update this list if I remember more good resources.

Calculus:

https://www.youtube.com/c/ProfessorLeonard

DSP, Digicom, Signals and Systems, Linear algebra:

https://www.youtube.com/user/allsignalprocessing

https://www.youtube.com/c/AdamPanagos

https://www.youtube.com/channel/UCrltzuSvRbL3rpsvLDnFkuQ

https://www.youtube.com/channel/UCdr-jNNA0j1POagvxbxtV-w

https://www.youtube.com/user/mfowler314

Embedded (ARM):

https://www.youtube.com/channel/UCMGXFEew8I6gzjg3tWen4Gw

FPGA:

https://www.youtube.com/channel/UCsdA-aNqtMA1_2T15aXePWw

https://www.youtube.com/user/ece4760 (Full course based on Altera De1-SoC)

https://www.youtube.com/c/FPGAsforBeginners

https://www.youtube.com/user/TheVipinkmenon (Zynq - Drivers, C)

https://www.youtube.com/user/mamsadegh2 (Zynq - AXI)

A little of everything:https://www.youtube.com/c/MichelvanBiezen