How can I prevent bullying from further taking place?

You can discourage people and also seek help. Tell someone responsible. There are many help lines and organisation available you can seek their help from them

Preventing bullying is typically not possible given the rules and regulations of today's schools and public places. Bullies will bully, however, befriending the bullied and confronting the bully afterwards is never the wrong answer.

Yes you can talk to an adult, just make sure you never physically fight the bully unless your defending your self.

If you are the one being bullied, take the wind out of their sails. Do not give the bullying individual the reaction that they need to feel satisfied.

A good way to prevent bullying is to first decide to stand up for your rights. We can start with realizing that everyone has strengths and weaknesses. So do you, and anyone trying to bully you. Most bullies are only trying to take unfair advantage of your goodness and/or weak points. You could start by introspecting what is allowing the bully to misbehave with you - is it a good quality like easily trusting or being naturally helpful that is sought to be misused? or is it some real or perceived weakness that is being targeted as a leverage over you? In any case, it helps to make up you mind to STOP submitting to the bullying tactics. Depending on the situation, you could choose to call out the bully's game immediately or tactfully withdraw at that point in time. You could choose to cut the bully off from your contact, if it is possible and makes sense for you. In other situations, you could start working on overcoming your weakness, if any and secretly thank the bully to get you started on a great improvement journey!!

You can further prevent bullying by being present, and taking action! If you or someone you know is being bullied, turn the bully in! REPORT! REPORT! REPORT! You should always report a bully, at school, work etc. Stand up for yourself and others! Don't back down, bullies like to pick on people they think won't do anything about it. One of the best things you can do for yourself is stand up for yourself. It takes all of the "fun" and "power" away from the bully. Once they start to see you're not afraid, they will more than likely back down.