In England every wiserd cheered because HARRY WAS THE BOY WHO LIVED. Mr. Dursley did not like that because they were wearing "silly" clothes (wiserd robes) and they were every ware.
He has been using his powers with out himself knowing and does not know how to control it. His aunt and uncle punish him because of all the things his powers make him do.
When he started getting letters from hogworts his aunt and uncle did not let him open any of them. More and more letters just kept coming.
He found a lot of clues leading to professor Snape trying to get the sorcers stone and told his friends and they wonted to help him stop Snape.
They got through all the traps protecting the stone and found out that it was not professor Snape it was..............PROFESSOR QUIRREL. If harry was not their the stone would be unsafe with professor Quirrel but with Harry the stone was destroded.