What are the good deeds that draw a Muslim closer to Allah and serve Muslims?

There are many and varied good deeds by which a Muslim serves his Muslim brother to draw closer to Allah, among them: offering advice in matters of religion and worldly affairs, teaching him what benefits him, giving him money, assisting him physically, enjoining good and forbidding evil, protecting him from harm, helping him solve his problems, defending him, guiding him to everything that benefits him, and keeping him away from what harms him.