I want to know if it's safe to buy Bitcoin without having the basic knowledge of it ?
Simple answer is no because you don't know what to do especially when crisis time happen. Newbie investors should always remember that there's always risk upon taking decision upon acquiring bitcoins since for sure their emotions will eat them and in the end they lose their money especially when they see the value of their holdings are melting due to market situation. Better invest for yourself first and learn basic knowledge about bitcoin since this is really a big help.
Other things will be learn thru experience so don't let yourself go unarmed with knowledge about cryptocurrency and bitcoin.