Perhaps you also like this German language video. It's fiction so you see actors, but I thought it might be a nice addition to the earlier posts here.
In this West-German series from the sixties which was based on real German-German espionage, a pretty realistic portray is given of a training on how to decipher the messages received by radio.
As way of translating I try to explain it here.
Still from the video

In the video you will see 3 papers on the wall;
the one on top is the one time pad
the one in the middle is the re-useable chart
the one on the bottom is the message and the calculation done with the one time pad.
The “false addition” used is called a Chinese addition. The number of the one time pad must be subtracted from the number of the message. If the number of the message is smaller than the one of the one time pad, “10” must be added.
So below 1 -3 becomes 11 – 3 = 8
3 – 2 = 1
1 – 4 = 7
message 1, 3, 1, 6, 9, 1, 7, 8
one time pad - 3, 2, 4, 9, 0, 0, 6, 3
result 8, 1, 7, 7, 9, 1, 1, 5
The results can then be looked up in the chart.
8 = E, 1 = R, 7 is blank, so the coordinate is the following number, in this case also 7. Then 7 (horizontal) and 7 (vertical) = W
This is where the video stops, it's only 1:20 min. long so I elaborate some more;
In the vertical line (starting point) are the numbers 9, 4, 7, 3
In the horizontal 1, 0, 2, 6, 5, 8 (correspondent)
So if we look below; 8 = E, 1 = R, 7 and 7 = W, 9 and 1 = A, 1 = R, 8 = E
result 8, 1, 7, 7, 9, 1, 1, 5, 8
Clear text E R W A R T E (AWAIT)
The whole message is;
ERWARTE DRINGEND NACHRICHT
Urgently awaiting message
This is the chart used by the infamous Ana Montes

I noticed also a funny coincidence. Remember that Mr Fätkenheuer said that 2 was N, well here it is too
https://www.youtube.com/watch?v=9BeMdp0xaHs&t=15s