Yes, Visio is free with Office 365, in its trial period, and you can use it to test it and decide whether the application is a right fit for your needs. But there is one more thing that you need to keep in mind. Visio in Office 365, offers you only viewing and sharing capabilities, for generating, creating, or editing in Visio, you need to buy its subscription, to acquire its full rights. If you wish to learn Business Analytics and want to advance your career in the chosen domain, I recommend you check out the Business Analyst course from a reputed e-learning institute like Intellipaat, which offers you industry-grade courses. Also, as a starter, watch the following video, on Business Analytics Tutorial to get a better idea.