The visionary and evangelistic skills that make a great founder are fundamentally different from the operational skills needed to run a large organization. Assuming a founder is the best person to manage a scaled company is a mistake.

A common mistake for former operators in venture is to project their own ideas for product and strategy onto a founder. This is dangerous because the investment must be based on the founder's vision and their ability to execute it. A VC's role is to support that vision, not replace it with their own.

A critical dichotomy exists between investors and founders. Investors who love an idea are prone to making compromises on team quality. Founders, however, must be deeply passionate about their idea, as starting a company is an irrational act that requires immense conviction to succeed.

An estimated 60% of VCs harm their portfolio companies by pushing a 'burn at all costs' mentality or pretending to know how to run the business. The best VCs are humble connectors who link founders with people who have successfully navigated similar growth stages before.

The most fulfilling and effective angel investments involve more than capital. Founders benefit most from investors who act as operators, offering hands-on help and staying involved in the business. This approach is more rewarding and can lead to better outcomes than passive check-writing.

An investor passed on Chime's seed round despite a strong founding team. The reason: he personally thought the product "makes no sense" and couldn't see himself building it. This illustrates a common early-stage trap where VCs substitute their own product ideas for the founder's vision, rather than betting on the team.

It's easy for investors to write checks because they feel for a founder and want them to succeed. Gary Vaynerchuk calls this ineffective "charity work." A true investment must be detached from this "bleeding heart syndrome" and focus objectively on the operator's capabilities and the business thesis.

Contrary to popular belief, becoming a deep expert in a sector can harm your angel investing returns. Experts tend to see all the existing roadblocks and regulations, dismissing breakthrough ideas that a naive but determined outsider might pursue successfully. The expert underwrites the past, not the potential future.

A common mistake for VCs, especially those with analytical backgrounds, is over-indexing on the "what"—the business model and market. The most critical factor at the seed stage is the "who"—the founder's intrinsic motivation to "walk through walls." This is the hardest element to diligence but the most important.