Sharepoint - Free Office 365 subscription
Join the Microsoft Office 365 Developer Program which will get you this:
Get virtual and in-person learning opportunities, benefits to help you become more innovative and successful, and access to connect with other developers.
- One-year, FREE Office 365 developer subscription
- Access to online trainings
- In-person office hours with Microsoft engineers
- Chances to win tickets to Microsoft conferences and industry events
- Opportunities to participate in virtual hackathons to build modern productivity solutions with Office
- Opportunities to meet with other developers in your area
- Previews of and insights into Office Extensibility
- Announcements
Another way to get the free subscription apart from Benny's suggestion.
If you or your company own a MSDN subscription then you will get following benefits.
- Office 365 Developer Subscription: Develop, test, and deploy add-ins for Office and SharePoint. Includes a one-tenant SharePoint Online Developer Site.
- Azure $150 monthly credit. You can build you own sharepoint farm.
- Pluralsight Full annual subscription. Learn SharePoint.