Bitcoin is very safe the fact that it has been years since it was first introduced and no one has ever penetrate the system. The only main problem in security in Bitcoin is the negligence of the users and didn't even do their own diligence to secure their wallet.
The network itself is safe but the accessibility is the one that would be the target of the hackers so that they can steal the cryptocurrencies. They would take advantage of those newbies who would easily believe what they are saying so that they can get free coins or perhaps free services.
Always be careful when someone asks you to download something to have free coins because most likely it has a virus that would have access to your gadgets and then take away your hard earned coins. Always be careful and do not attract the attention of the people by posting how much coins you have in social media and forums.