Having 3 titanium bikes I can say really all you need is anti seize paste and a little check up with some regularity just like you would with any seatpost on any bike. Nothing exceptionally special and you can use the anti seize for steel or aluminum as well. Basically you are greasing metal on metal components but with a slightly different compound however you can use just standard grease but make sure to check it more frequently.
This is what I use but any anti seize or copper paste will work:
https://www.parktool.com/product/ant...compound-asc-1