Should I learn new skills together or apart?

Is it best to learn new things together or by themselves? For instance I'm learning

Pen spinning

Card tricks

Krav Maga

And a few other things because I started to feel like life got boring. I don't really know if it's best to learn them together or progress one to a certain level then the next. Any tips would be nice!

Tldr; Should I learn new skills together or separate