W - hold to walk forward
mouse - move camera, also turn left/right while walking
W, A, S, D - use these to turn in place while standing without moving camera
SHIFT - sprint - hold it while walking
CTRL - hold to crouch (only some species can crouch; crouching hides your nametag)
SPACEBAR - jump (only some species)
E - eat/drink, aim with centre of your dino body at food and press button to eat, you may press few times depending on your hunger/thirst lvl (note: currently it doesn't matter what kind of food you eat - yes, you can eat plants as carnivore and meat as herbivore, have fun)
F - call, roar
H - press to rest, press again to get up
J - sleep, press it while resting, press again to wake
mouse buttons - attack (some species have only1 attack)

Additionally for Spinosaurus:
Q/R - use while swimming to dive down/up (by default spino swims at surface of water, moving camera down won't make you dive like in aquatic species)

W or D - move forward (no idea why both buttons do the same)
A or S - move backward
moving mouse - turn right/left and up/down (you may want change mouse sensivity to higher for moving up/down)
SHIFT - hold to sprint while moving forward
mouse buttons - attacks (I think not every specie has attack or i missed animation)

ENTER - press to open chat, press again without typing message to let it hide after few seconds

I will update guide whenever I learn anything new or whenever anything change after new patches.

If I missed anything, feel free to tell about it in comments section, I will add it to guide. Also feel free to correct language mistakes, english isn't my native language.