What is the exact translation of "ben Sorer u'Moreh"?
Rashi: 'A son who has strayed from the path of Torah and who refuses to obey
his father (and his mother)'.
It is a Lashon of "Mamrim" - 'rebels'.
What is the age of a ben Sorer u'Moreh?
Ramban (citing Sanhedrin, 68b): A ben Sorer u'Moreh is thirteen years old
and has grown two pubic hairs.
See Torah Temimah, note 135.
Since a Katan is not subject to punishable and is Patur from all Mitzvos..
What does "Veyisru oso" mean?
Rashi: It means that they warn him in font ot two witnesses and he receives Malkos at the hand of three Dayanim.