1.Can anything harm you when your astral projecting?
AP is safe, physically, you'll be fine, your body always has a shield up, if there's any danger your astral self will return to your body almost instantly. this being said, your astral self can be harmed. it's rare mind you, unless you're going to go chasing astral beings. think about when you're hurt in a dream, you're physically fine, you may feel the pain, but once you wake up it's gone. it's similar if you're injured in the astral. i've been projecting for almost 5 years now, and i work with dragons, i've only been injured once, i woke up almost instantly, and the pain was gone, was a little shaken up, but other than that fine. it's like a dream, nothing more.
2.If yes, then how can you protect yourself from it?
as i said, physically you've not nothing to worry about. if you want a little extra protection, cast a circle, or wear a protection charm. astrally, as i said, only attached once, that was out of my own stupidity, so just think before you do. things don't sneak up and attack you. so long as you don't go around attacking astral beings, or bugging them, you'll be fine.
3.What all can you do well [while] astral projecting.
anything you can think of really. the astral is similar to the physical, but as you grow, some people can create their own realms. personally, i only go there to communicate with dragons, so i'm, not too sure of it's limits because i basically walk around talking with dragons.
4.Can you talk with gods/relatives/angels we'll projecting?
never tried, never tried, and never tried. angels, i think so, spirits while you're in the ethral i believe so [myself i speak with them without projecting, so i've never tried] and gods, never thought about it so, sorry, don't know. when you start out, you should just float around your room, branch out into your hallway, to get a feel for it. some people can see you [similar to seeing ghosts] so, yiou can spy on living beings, it's just not recommended.
5.Just, Is it safe.
yes, it's safe. nothing in this life comes with a 100% stamp of safety approval, but as far as safety goes, it's 99% safe. when you're in the astral, whatever you want to see/do, you'll draw to you. if you want to see mermaids, think of mermaids swimming in a bond and you'll be taken to a place similar to what you wish. if at any point you feel in danger, think of your room and you'll be back there, then think of your body, and you'll wake up [thinking of your body only will be a bit of a jolt to your system, so you might wake up feeling ackie.]
if you have any fears, you won't be able to project, or at least will find it extremely difficult. start slowly, just stick around your room until you feel like branching out, baby steps.