I am new (to all of this, Pis, Linux, etc). This is my first real attempt at working directly with hardware as well.
I needed a new project so I got a Canakit started set which came with a Raspi 3B+, a 32gb samsung evo sd card, a power cable, heat sinks and screws and an hdmi cable and a case (which I am currently not using). I put on the heat sinks and used my Win 7 computer to burn the arm rp3 version of kali linux. I got the image directly from their site. I used win32diskimager.
It runs for awhile and then says it is complete. So I take it out and put it in the rp and plug it in. The power light is on, and the blinky light is blinking (what is that anyways, the activity light?). But All I get is the rainbow screen. I tired redownloading the disk image and actually installing win32 again to burn it for a second time. And I used a different adapter and port. Rainbow screen again. I even used a different outlet in case something was wrong with my surge protector. How do I make this work?