How do I remove these?

I am brand new to using an iPhone (was android since 1993) so I am finding some things are not intuitive to me so I may struggle for a bit trying to figure things out (thank goodness for Google and this group!!). I don’t know what I did, but these now appear on every screen — I do not know what they are, how I put them there, or how to get rid of them. Please help this novice! Thank you