It is impossible to reproduce examples from youtube documentation and tutorials, even from purchased houdini courses.

Never my houdini version is the same as the houdini version used in the youtube tutorial or even in the official course.

I reproduce an example from a tutorial or course until I get stuck with an instrument parameter that has been changed in my version of houdini or the version of houdini from the tutorial.

In the official documentation I found tutorials and explanations related to houdini version 13.

Absurd - I can't learn

Can anyone advise me tutorials or explanations that can be reproduced in my 19.5 version of houdini?

I don't know what to do...

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Yep, old tutorials can lead to a dead end. Try visiting the tutorials on this site under the Learn menu up top. You can filter by Houdini version to find guidance that matches your install. Don't give up. At the start, the learning curve is a little steep, but once you climb that hill, you'll see a blooming meadow of visual effects.

It takes about a year for Houdini to sink in, at least for me, it did.