A number of websites fail to open when I visit them. I have been advised that the cache on my 2019 MacBook Pro needs to be emptied to improve the efficiency of the computer. When I went into Go/library/cache I found at least 60 folders with cache in their name and in each folder there would be a small number of files or in some folders no files at all. Should I delete the contents of all these folders? What about the empty folders? Do I leave them empty?