Always fly when exploring a new area - most aggro mobs can not attack(insta-kill) if you are on different elevations BEFORE A FIGHT HAPPENs.
Hoshijns should wait until LP to softcap/overcap as your higher STA/Ki will let you get higher gains because you use higher gravity - this is especially true at lv51. Slowly inch closer towards the 4M base cap. Then wait for Life Phase(20M) then go into a PD/Excel/HBTC to overcap there. You will get 1M-1,3M gains whilst other races only have to overcap to about 300k gains.
Hoshijin should ALWAYS use their Topaz 4 times a day even if you portal once in that time. The Topaz will only recharge if it has been fully used(0 uses left), make sure to remember how many times you've used it
Get Slacker trait as a Hoshijin. It's a free trait for you most of the time(that Death Phase...)
[Hoshijin] Get Enlightenment to at the very least 40/100. It has a chance to give a % EXP of your overall(not current) TNL, and also gives you +10WIS. Use skill during RP for EXP during RP and just before you gain for more PS
If you're a newbie then you should pick a sensei with the Sense skill. This is to help you find your way back to your sensei if you ever get lost/you can't see because it's night/dark and you have no flashlight.
When you're sparring it's common courtesy to just use punch/elbow/kick/knee. The other melee skills knock-out or trip the other character and they have larger cooldowns(less spar gains).
Better to use an Excel House than the HBTC. Gains are mostly the same and an Excel House does not cost you 5RPP to go into each time.