I was wondering if there was any other way to speed up Tech point earning other than Science Technoligies and 2x speed?

Using the children to gather duplicate collectibles can help a lot, especially early in the game.

Thanks for the help. I really needed some

To put more villagers at researching and to make them earning more research skills. So they are more talented and they earn more tech points!!
To put the kids on the collectibles is really helpful!

Now I have enough tech points for every skill, but I dont know which one I should get. I want the most important thing. Is there one to get food easier? I am guessing Alchemy, but I dont know.

Are you playing VV3? (Alchemy is only in VV3)
Because here we are in a VV2 thread!

(ps: Alchemy is not the best one for getting food!)

I'll operate on the assumption that this is VV3 we're talking about. This thread is not clearly marked spoiler, only "may spoil", so I won't post anything but your options here; there is one option for another source of food quickly, that's also limited, but there's also a long-term option for unlimited food, which you won't be able to get right away.

They're both related to puzzles; for more information on how to solve the puzzles including detailed guides, check the VV3 forum.