What do you think about raid 0, raid 1 and about hot spare?

Question

ssd + ssd seems faster, but its quite expensive.
hhd + hhd looks safety and more specious .

Answer 1

I don't see the point of using Raid 0 with SSDs as it's mostly about quickly saving/accessing big amounts of data. SSDs are already very fast themselves and don't offer a lot of space.

Raid 1 is about data redundancy, so you have a backup and can just replace a HDD in case one of them breaks. Very secure.

Raid 5 is also very common and basically inbetween speed (striping like Raid 0) and security (instead of mirroring like Raid 1 it adds parity bits that help restoring lost data)

What do you mean by "hot spare"?

Answer 2

I read that its pretty good to have a hot spare on RAID , except raid 0.
Does it make sence to put raid on a home pc (dumb question) ?