Hello, I would like to know which partitions should do to put on the HDD, since I will install Lubuntu on an SSD, and I will not be making use of writing all the time ... By now I think: /usr /var /tmp /home, /swap, etc ...

What more?

Regards!

/usr should only ever be written to when installing new software. Unless you are going to be installing and uninstalling things a lot, that wouldn't be written to very much.

Also, swap isn't in the file system, just so you know.

That pretty much covers the basics. Also, there are certain things to take into account when using an SSD. Look into this a little bit: https://wiki.archlinux.org/index.php/Solid_State_Drives

If you want to save write cycles to the SSD I would create /tmp and the swap partition/file to the HDD.
If you want to go for performance (the main reason why most people use a SSD in the first place) I would put them on the SSD (at least swap, if you have enough RAM I would rather put /tmp into RAM).

On thing you should think about is your /home partition. I usually put it on the SSD, with a separate data-partition on a HDD with symlinked directories for things like photos, videos, ... . This way I do my stuff on the fast SSD in /home and store data on the HDD pretty transparent.

If you want to save write cycles, then put /tmp into RAM

Everything else should probably be on the SSD so any changes are persistent across reboots.