Nice tips, thanks.
Not a secret or anything, but a nice tool that I forget to use too often but like when I remember it is the Summarize command. Highlight some text on web site, in an email or document, etc. and then select Summarize under the Services menu from that app's main menu. It brings up a condensed version of the text with a slider bar that can control the percentage of condensing. It usually does a surprisingly good job of finding the critical meaning of a bunch of text.
My apologies if this is obviously known by all, but I don't see it get a lot of attention. I wish it existed in iOS too.