Is there a place where there are suggestions of tips on the tech items you should by in succession?

I don't think you can find detailed information about that in the guide section. Probably because there are several different strategies that will work. My strategy is to keep the population low and put everyone except one farmer on research. And then get enough tech points for both farming level 2 and construction level 2. After that I put all the scientist to get tech points for level 3 farming. During this procedure I keep the population below 15 villagers in order to have enough food for them.

I just started a new village last night.I made sure before I closed it down last night there was only 15 people.I had level2 farming before Iwent to bed.by noon today I was able to get level 3 farming.So they will never run out of food.Now I will just work on building points to get the other levels.

I always find all the puzzles without level 3 science and level 3 exploration!