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by sova 2851 days ago
Great question. Anything that furthers the field and does not risk becoming irrelevant in 6 months would be an excellent bet.

+ Utilities for computers and disks are always useful and don't need much maintenance for long-term function/feasibility.

+ web frameworks that make web designing/dev easier (clojure[script], rails, python+django are all popular choices)

+ Look for a tool you commonly use or a service that's commonly requested.