If you wonder about how your Solid State Drive works this video is for you.
This video exaplains the physics beyond the flash memory cell, showing Single Level Cell and Multi Level Cells charateristics. You can find here a comparison between the NOR and the NAND configuration and understand why the NAND technology is so widespread. You can find the read, program and erase operations.
For an explanation of DRAM and SRAM working watch:
DRAM vs SRAM
https://youtu.be/mVsJd0vJkMA
For a good explanation of diode working watch this:
https://youtu.be/BSRybfkix_A