This corresponds to the pixel(frag) and vertex shader nodes in TD, eg if you open up a GLSL MAT. So to start try pasting them into those nodes to play with them.
There are some great tutorials on youtube for working with GLSL by Vincent Houze and Matthew Ragan which you will probably find useful to set yourself up to do more, and there’s a nice .TOX file on this forum which automatically converts Shadertoy GLSL to TD GLSL (I know yours isn’t on Shadertoy but I found it a useful place to start figuring out any conversion): viewtopic.php?f=4&t=7858