Harry's signature spell is Expelliarmus, which causes the enemy's wand to be knocked out of their hand. He likes using it because it only disarms them instead of hurting them giving Harry time or causing the enemy to back-off.
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There is no such thing as a love spell in Harry Potter. There are however, love potions such as Amortentia which is the most powerful love potion. It should be noted that no magic can ever create love - only the feeling of love.
There is no love spell mentioned in the Harry Potter series. However there are love potions, the most powerful of which is called Amortentia.
The spell Expecto Patronum is a spell Harry learns to cast in his 3rd year at Hogwarts in JK Rowlings famous series. The spell conjures a patronus that drives away dementors by countering their need to feed on unhappiness with a happy memory. Harry Potter's patronus in particular takes the form of a white stag.
The spell that opens a locked door is "Alohomora!" The spell is taught during the first year of education at Hogwarts. The first book in the Harry Potter series -- Harry Potter and the Sorcerer's Stone -- chronicles Harry's first year. "Alohomora" is a charm and thus would've been taught by Filius Flitwick during Harry Potter's time at Hogwarts.
Malfoy.
Protego.
Alohomora