Do some Lessons cost points?

Do some lessons cost point when you chose them ? How to be aware about that ? It seems that I have choosen some without having been informed that they would cost some points… How it works ?

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Some professional content providers offer their content for sale as Premium content. We may add additional premium content in the future but we are not moving away from Free content which continues to be added and shared all the time.
You can recognize Premium lessons by the yellow “BUY” button instead of blue “OPEN”. Also, when you click on the “BUY” button, you first get popup notification that a lesson in Premium and how many points it costs.

Thanks Zoran.
It seems this Button BUY and pop up with points is not enough clear. Maybe I bought form the app and is not clear enough for me. because I really don’t remembre to have click on them.