As an explorer I’d add in scanning skills. As you evolve in the game these become more or less vital, and learning them early can open up many additional options even to newer players.
Research and invention skills. You can make a handy profit from alts being able to research 11 BPO’s at a time, BPO max-run copies, or from invention. Even if you have no use for the BPO’s or invented T2 BPC’s they can be sold at a much higher price than the original, unresearched BPO. Players are willing to pay quite a bit for BPO’s they don’t have to spend time on researching. Your alts could be doing this 24/7 in the background.
If you don’t have a trade alt, the get the skills for reducing tax costs, and related trading skills etc trained up. Good way to save money on buying and selling.