CW Resources

Koch's method
Traditionally, Morse code has been taught by struggling through all the codes at a slow speed and then (slowly) progressing towards higher speeds.
Koch's method, on the other hand, dictates that you should start learning at the desired speed - but you start with only two characters. Each session is five minutes long, and whenever you get 90% or more correct, you add another character.  
Just Learn Morse Code utilizes Koch's method for teaching Morse code.
Farnsworth timingTraditionally, reducing the speed of Morse code has been done by making everything take longer, i.e. both the sounds and the silent periods between them.Using Farnsworth timing, characters are sent at the same speed as at higher speeds, while extra spacing is inserted between characters and words to slow the transmission down. The advantage of this is that you get used to recognizing characters at a higher speed, and thus it will be easier to increase the speed later on.
Using Farnsworth timing is optional in Just Learn Morse Code.
The ARRL uses Farnsworth timing for transmissions, practice and test tapes up to 18 WPM (90 CPM).
Farnsworth timing was invented by Donald R. Farnsworth (W6TTB) in thelate 1950s.
 
Apps
 
            iOS
            Ham Morse
            Koch Trainer
            Morse-it
            PC
            Just learn Morse code
http://www.g4fon.net  go to the Koch trainer
            https://lcwo.net
 
Websites
 http://www.skccgroup.com   Complete information CW ops. Join grouper a good way to start and get into CW
https://www.qsl.net/n1irz/finley.morse.html  Good Morse code reference page (just learn Morse code)
            
Videos
https://www.youtube.com/results?search_query=lockdown+morse This site came up as a COVID 19 get away
https://www.youtube.com/watch?v=uadDqm0pObY  Old US Navy training film
https://www.youtube.com/watch?v=x6ggckXtZjs        Up dated sending by a German trained sailor      
https://www.youtube.com/watch?v=qmg1MlstxWM          Old US Navy training film
https://www.youtube.com/watch?v=D_oXTSQ4AGk          Ask Dave 13: The CW Renaissance https://www.youtube.com/watch?v=3sqiyJi6YM8Ham Radio - Learning Morse code, three things to avoid for better sending
On air code practice W1AW  http://www.arrl.org/w1aw-operating-schedule