Keep all you can on the SSD for better performance.
That is what you bought it for.
Once it starts to fill up, say at85% then move large sequential files such as videos and backups to the hard drive where performance is not impacted.
And,rejoice with large reads and writes to the ssd. You are getting what you paid for.
Endurance is o issue with a 240gb ssd so long as you are under 90% full.
If you google for ssd "tweaks" Ignore them.
They might have been applicable many years ago when a ssd was 40gb, but not today.