control scructure repeat and next line

[hershrev]

Hello every body .
this probably is a first grade question but ....
1) the repeat structure  I want to do a repeat till the end of a list 
or end of file ? I did relies the repeat for each , I don't understand 
the logic behind it. how to use it
2) which command tells to move to the next line (and then to  "put the 
selectedText into myVar"), by words I "put word myWord in a repeat so 
it just keeps on moving. ?
sorry for this silly question
and by the way a question , why selectedText , selectedLine, don't 
return the same data type . The selectedLine returns the line # and the 
selectedText returns the text itself  , shouldn't  the seletedLine 
return the string of the line as well ? isn't an inconsistency ?
Sorry , but Thanks.