i want to know, idk how it works

the more science you have the more techs you can research

so i can like research anything? is it like a linear progression?

the tech tree is like civ

So the more "science" points I have the faster I can research different tech, if I understand I can still research tech it just goes VERY slow with low science?  I just need to figure out where science comes from, and why it works the way it does.  4X games are new to me, I have only known about them a couple months, but humankind is just outstanding concept so I will take as long as I need and read as much as I can to understand everything 

In Humankind most science points will come from cities, though you can get occasional one off bonuses from things you find by scouting, and probably by civ traits or luxuries.

Most will either come from tiles that you exploit (i.e. they are next to one of your quarters and look different/like people are working them), from people assigned to science, or from things you build.

You can see the value of each tile by clicking on the middle one of the three circles in the bottom right hand corner. Certainly at first it's very helpful to play with this view on as you can see how good different tiles are and focus on exploiting them by building expansions that take advantage of them. Science is blue and is considerably more rare than food or industry.

When you open your city you can change the jobs of the people who live in your city in the top row. You can drag and drop the little people around. There's one of these for each inhabitant, which is the main bonus of growing your city. Note - food is not linear, so if you're in the middle of growth with no chance to get to super growth or stagnation, move people from food to other jobs. You can see where your food is by hovering over the food. If you do this with science you will see where science comes from and probably my whole reply could just have been this tip!

Finally, you can build infrastructure that gets you more science (once you've researched Writing), and once you move forward in eras there are also expansions that get you more science. Iron mines get you science as well. There's also a wonder you can build that gets you more science.

Oh, and yeah, there's some super useful events that get you absolutely tons of science if you pick the option favouring science.

Basically, there's loads of ways to get science. Hovering over the word science will give you a great tooltip to help make sense of this.

Amplitudes games can often be a bit counter intuitive at first but they always end up being some of my favourite games if you put the work in. Hopefully that'll work for you too!

You can also get science boost from "Discoveries" (equivalent of goody hut from civ)

To research a tech you need to have one of the previous linked tech already researched,so its like having several lines of tech which can cross each other