Aircraft 101: Radars, stealth, ECM and more!

I did not know which thread to put this one in, so I decided I might as well start a new one…

Lots of “basic” stuff on radars, ECM, stealth, and even one on “fundamental principles of airplane flight”:

https://basicsaboutaerodynamicsandavionics.wordpress.com/

I am no expert on any of these fields, but with my limited understanding it looks quite accurate to me, and also quite well described.

What do the experts say? Is this a good source for basic info for the lay person?