Accio.
Depulso
The charm accio is used often in the Harry Potter books, the most memerable of which is in the triwizard tournament when harry summons his broom to defeat the Hungarian horntail dragon. it is used often as it is a useful charm.
That spell would be Accio.
Digitalis is not a spell in Harry Potter.
Impervius. it repels water :-)
Reparo a spell that is used alot through the books 3-7
"Alohamora" is the spell that unlocks things.
Harry Potter's favorite spell was Expelliarmus (disarming spell) but he also used Stupefy (stunning spell) a lot.
no
Harry Potter doesn't use a spell to fly, he flies using an enchanted broomstick.
There is no weak spell in Harry Potter. It is only weak if they caster of the spell is weak. When you cast a spell say it loud and clear.
the spell is a charm