I tend to save pdfs or text files on Google drive ( in case I need them
while away in the motorhome).
I can’t claim they are well organised, they aren’t.
Sometimes I print one out and it goes in one of those clear sleeves with
holes to go in an A4 file.
The problem with apps is the range of sources. I find recipes on YouTube -
some of which you need to transcribe, others from websites, some from the
TV, ……