A string can be defined without and with quotes as the following examples
here all is a string 'my string definition' "it is another string definition"
The character (|) means multi-line strings, following an example.
lines: | text line 1 text line 2 text line 3
The character (>) can be used to concatenate strings, following an example.
my_text: > Here is my very long, long, long, long sentence.