The document discusses lessons learned from software business experiences, including that software should do a few things well without negatively impacting users' computers. It recommends keeping development teams small by having no more than two people per feature and three parallel features. While fashion trends change, software fashion should be tailored to customers' needs without obsessing over changes. Constants to expect are that more developers will likely lead to more concurrent features, software slows faster than hardware speeds up, 10% of developers write 80% of code, and 5% of developers create 50% of bugs. It also notes that funding a development team costs $10,000 per member per month.