Whatever instrument you play you use scales.
There are many guitarists and but less so pianists, who claim they have never used a scale in their life and don’t need to.
They are playing using scales they just don’t know them. They just know the notes that sound right when playing in each key.
It is so much better to know scales. To know every note on a music scale is so much easier than trying to work out which notes work while playing.
In the paid section of this site, I even have a complete scales course, because scales are so important.
To start you off right, tell me where to send your book to and I will send you a scales book from my course. Completely free of charge.