From https://iainabernethy.co.uk/content/different-terms-used-bunkai:
There is the analysing part (Bunkai/Bunseki) and then there is the practical part (Oyo).
Omote and Ura are two sides to the same medal in the japanese culture. Omote is the obvious and Ura is the hidden introverted side.
When you can apply a technique superficially only in a certain situation it is Omote and when you understand the principles an you can apply them in any situation that is Ura.
Henka means change, variation or diversion. So here you change the Omote form of a technique. For example when there is a Tsuki-technique to Chudan level you simply change the level to Jodan or Gedan.
[However,] to western ears [these terms] rarely leads to clarity. The cover all term of “bunkai” is what I use these days with the various aspects and subsections being explained in plain English.
Also see Enkamp: Karate Bunkai: 3 Levels of Kata Application (Omote, Ura, Honto)
These are not our style, but I think you can learn about how to improve your katas by watching them:
Other videos from which you can learn about how to improve your katas by watching them:
"When there are no avenues of escape or one is caught even before any attempt to escape can be made, then for the first time the use of self-defense techniques should be considered. Even at times like these, do not show any intention of attacking, but first let the attacker become careless. At that time attack him concentrating one's whole strength in one blow to a vital point and in the moment of surprise, escape and seek shelter and help." – Gichin Funakoshi
