Choosing what to learn: an analogy to investment portfolios

The field of computer programming is vast, it's hard to know what to learn. An experienced programmer (thank you Warren) suggested an analogy to financial investment: low, medium, and high risk. Here is how I categorize some topics.

Low Risk : how we earn our bread and butter

Medium Risk

High Risk : a small chance of a huge payoff

What are your topics of interest? Into which category does each fall? Let me know @dicshaunary on Twitter.