The Wizarding World isn't as powerful as it was without the spells and magic that brought it to life. While there were spells that made life easier, such as Reparo, there were also spells that could be used defensively, like Protego, or offensively, like Stupefy. No matter the need, spells and charms were the backbones of the world of Harry Potter. But the titular hero of the franchise had his own arsenal of charms and spells that saved his life on more than one occasion.
Source：https://www.cbr.com/harry-potter-signature-spell-defined-character/
