Description of Research Points assigment
The tree has 4 ( spot 4,8,12,26 ) survivor slots nodes which has to be picked up first, then we can proceed to expanding the tree. You can use this Research Tree Tier 1 Calculator to check what suits you the best.
The preferred way to assign points Offense > Fortitude > Tech > Resistance.
Follow the numeration to get the most efficient patch. You will need total of 20 research nodes assigned to proceed to the Tier 2 research tree. So after assigning 20 points click the number 21 and proceed to the next tier.
Optional : You can eventually swap some positions pre 20 points to get the storage expanding. The Boat and Bike isn’t really required and possibly won’t be used in early game also.
Please mind that the research points are hourly generated and it’s much more efficient to stop at 20 points in the first tree and move on to the next.