John 14:15–17, 26–27, 15:26–27, 16:7–8, 13–14; The Savior’s Instructions about the Holy Ghost

John 14-16 teaches a lot about the Holy Ghost and how what we must do to receive the Holy Ghost. In John 14:15-17 teaches that the Holy Ghost will give us comfort in our times of need and will tell us of truth it also tells us that the world cannot receive this truth. John 14:26-27 continues to teach us more like that the Holy Ghost will teach us all things and will bring things to our remembrance and will give us peace. John 15:26-27 teaches us that that the Holy Ghost with testify of Christ and that we must bear witness of Christ. John 16:7-8 continues to teach us more such as that Christ can send us the Holy Ghost as a comforter and that the Holy Ghost will reprove the world of sin. In verses 13-14 we continue to learn that the Holy Ghost will guide us to truth, he will show us things to come and that he will glorify Christ and the Father. We also learn from the Bible Dictionary that the Holy Ghost  can cleanse us form sin, and is necessary to gain a testimony.
The Holy Ghost helped the apostles to teach and preach the gospel in many ways after the death and resurrection of Christ. The Holy Ghost helped them to preach the truth and testified the truth to those who heard the words. I would also assume that the Holy Ghost gave the apostles comfort as they were going through hard times after the death of Christ.
The Holy Ghost has helped me many times throughout my life, one of the biggest things that they Holy Ghost has helped me to know and understand is my major. When I first started college last fall I had no idea what I wanted to do for my major, so I started praying about it. Then when people started asking what my major was I started saying special education. I had absolutely no idea where that came from, but I decided to trust it and change my major to it. Shortly after this experience I was in a special education class and I felt the spirit so overwhelmingly and I knew for sure that I was doing exactly what I should. I know that the Holy Ghost told me what I should do and that the Holy Ghost really does and will help us in our lives.