I do get my Bitcoin from doing works. I offer my service and in return they pay me in Bitcoin or cryptocurrency which then I convert to Bitcoin. I do use my Bitcoin for my daily expenses and save some for future use or future profit.
Actually, you could not get bitcoin if you do not have work and the best work in bitcoin is in trading and investing where you could gain more income. If you some skills in trading and investing you can definitely gain high income. However, some bitcoin users get their bitcoin on bitcoin forum.
Trading and investing are no doubt best methods for making large money with bitcoin but both have few requirements. Trading is as we all know proper profession, you should have deep knowledge about market situations of different coins whereas in investing, you should have some good capital to invest into bitcoin. For me, the best method of making bitcoin is to simply earn them through different signature campaign.