Two Hex on the front where it's wiggable (Two redarrows on the pic)
needs to be tightened annoyingly often if you're a little playful when driving.
There's supposed to be LockTite on them from the factory but thats far from allways the case.
If there are blue stuff on them and they still loosen you need to ether get more Boring or apply some stronger stuff to them.
If you go for no reduced Fun while Riding you should probably get Stainless Steel bolts too just in case you ever need then off again.
While youre at it check every bolt you can see.
Loosing_Bolts_ES2_2018.jpg