Text insertion cursor very hard to see over black background
I use MouseCape. You can find premade "Capes" for your cursor online, or draw your own and save them as png images. It does take some tinkering around if you're a perfectionist, but I made a really beautiful one in InkScape and use it all the time now. Albeit it took me like half an hour to get the size right in MouseCape so...have patience. ;)

Here is the design I currently use: 


This is a copy that I modified to work better on black backgrounds: 


Here is an example of it on black: 


Let me know if you'd like me to make you a custom one, like an all white version or white with a thin black outline.