Hello
welcome to this forum. What you asked is a very classical question, if you invest some time learning the basics of the tool you will surely manage to do it.
here are some guides for this forum
In order to make this pattern you need some stars (polar array of a line). Points can be used from this tool
In order to thicken it the most simple thing is to use Clipper plugin, 2 or 3 plugins are available on Food4rhino. I use this one
You must provide 3 lines in the same branch of a datatree and an offset for each Branch.
Y shaped cross pattern V2.gh (15.8 KB)
And could be changed to 4 sided crosses
Y shaped cross pattern V3.gh (18.5 KB)