Well if you have a job, make sure to invest some of the money, you get by it, at the end of the month in Bitcoin - like 5%-10% or something. I think this will be the most secure way, since you wont notice the money you are investing and you will always have some Bitcoin. Then just keep the Bitcoin and don't touch it - by a couple of years your investment may turn into "gold" 
The other thing that comes to my mind is to invest in some Proof of Stake alt coin that is promising - like for example Solarcoin, which is growing stronger and stronger everyday, and just let your wallet stake the amount and your coins will grow by a small amount everyday 
The other thing that comes to my mind is to invest in some Proof of Stake alt coin that is promising - like for example Solarcoin, which is growing stronger and stronger everyday, and just let your wallet stake the amount and your coins will grow by a small amount everyday Good idea. I'll do this now. I also find doing some freelance work during day off to be profitable like writing articles and 3d modelling for indie game studios.
One steady income I know is build an online music store (blendcraft.bandcamp.com) if you have a heart in music. Well it worked for me. I compose some relaxing music, specifically, Celtic tunes. My listeners are growing and they find my music to be motivational especially when they listen to it when reading or studying. I receive small bucks every now and then. Yeah the earnings are small but they do add up. I use the extra money on computer parts.