Case studies are perhaps the best way to learn from others' experiences - especially from companies that have undergone digital transformation. You'll find descriptions of real-life implementations: from choosing and launching a CRM (e.g. HubSpot vs. Salesforce) to building an e-commerce store on a platform like Shopify or Magento. Each study shows specific technology decisions made by entrepreneurs - why they decided on a particular solution, what problems they encountered during implementation and how they eventually solved them. Sometimes it turned out that a cheaper tool was enough, other times migrating from local servers to the cloud (AWS/Azure/GCP) was more complex than expected - this may suggest that maintenance and support costs are also worth considering. We provide actual project costs, implementation time and measurable benefits after a few months of use; this seems useful when planning your own investments. We analyze different types of software - from ERP for manufacturing companies to dedicated web applications for service providers - and show specific examples of process automation, warehouse integration or improved IT security. Each story ends with practical lessons you can immediately apply to your business; these are not abstract theories, but real-life experiences of entrepreneurs that will help you avoid common mistakes and make better technology decisions.