bplans.com
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Bplans is a comprehensive resource for business planning, offering free sample business plans, templates, and expert guidance on writing plans, financial projections, market research, and funding.
More resources on Business Planning
leanstartup.co
Lean Startup Co. offers training, workshops, and resources based on the lean startup methodology to help teams plan, test, and validate business ideas quickly. Its site features articles, guides, case studies, and practical tools centered on build–measure–learn and iterative product development.
Entrepreneurship: Building a Business Plan
Coursera course: Building the Business Model for Corporate Entrepreneurs
score.org
SCORE.org is a nonprofit that provides free, confidential mentoring and low-cost education for small businesses, with extensive business planning resources, templates, webinars, and guidance from volunteer mentors.