Please read the Explanation of Nawawi's 40 Hadeeths by Shaykh Al-Uthaymeen, available in English. If you are not memorising the hadeeths, then you might wish to skip the first two questions.
Can be intentional or unintentional
Should not be done intentionally, even to the person who has harmed you
Is worse if you intended to cause harm
Must be stopped if you realise that you were unintentionally causing harm to them
They might be harmed by us them without realising it
We must not continue to harm them by our actions, even if we intended no harm
We are allowed to harm non-Muslim neighbours but not Muslim ones
The scholars extract many rulings about the neighbours from this very short hadeeth
The rulings of seeking knowledge
Being righteous
How fiqh rulings are extracted
The rights of the neighbour
The rulings of the masjid
Aboo Sinaan al Khudree
Aboo Saeed al Khudree
Saad ibn Maalik ibn Sinaan
Maalik ibn Saaed Al Khudri
The one making the claim
The accused
A neutral third party
Witnesses
Events
Anything that clarifies the truth
The accuser must take an oath that he is correct, then he is given what he claimed
The accused must take an oath to declare himself innocent, then he is considered free
If the accused fails to take an oath then the ruling goes against him
The judge rules on the balance of probabilities
Ideally, a jury decides by majority
Wealth and blood
Offspring and riding beasts
Honour and reputation
Lineage and ancestry