Do I use ext4 for all partitions (such as / and /boot)? What are the other formats used for?

Do I use ext4 for all partitions (such as / and /boot)? What are the other
formats used for?

I'm installing ubuntu onto a new laptop with 24gb SSD and a 500gb HDD. I
wanted to put / and swap onto the SSD and /home onto the HDD. Is there
anything I shouldn't use ext4 for?
I do not ever intend to dual boot. Ubuntu only.