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I am not sure I understand your question, @UrsAngel , but I assume it has to do with the 30 Days to Play Course?
A typical 12 bar blues is 4 bars of A, 2 bars of D, @ bars of A, a bar of E, a bar of D, and finally 2 bars of A then it goes around again. Is that what you are asking about?
This is in the key of A, so it is the most important chord, the “home” chord. The D is the “4” chord and the E is the “5” chord. You will learn more about these chords and their significance as time goes on. Yes, there are many more “sections” that are possible in different songs and different genres. But you will learn that the 1, 4 and 5 chords are the most “important” chords in Western Music.
I hope I have helped. Please let us know if you have more questions.
MG 😀