Bitcoin is something attracting allot of my attention in both investing, online interests as well as general technical interest, I see it as both an interesting hobby as well as a currency/investment, and enjoy spending hours a day just reading about it.

There is no combination for "risk-free" and "invest", any investment does have a risk to the invested money and the profit earned would likely be related to the degree of risk you put your money through.
Trading and buying altcoins is extremely risky, lending p2p is even more, investing in gambling websites is gambling with a little bit better odds and buying stocks of bitcoin operations in havelock is combining both stock trading risk and bitcoin risk.
The safest way to keep BTC is holding it, and even then, the risk of USD fluctuation exist, but a 45 BTC will stay as a a 45 BTC sum.