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If you dont have strong CPU or GPU nor ASIC and you still want to try to mine something, you can try Burst. It is proof of capacity coin and it does use your HDD - very innovative.

https://steemit.com/burst/@eirik/so-you-thought-you-would-just-install-burst-wallet-and-mine

Thanx for link

If I were starting today, I'd just buy the cryptocurrencies and trade them. But if you insist on mining, I'd mine a GPU based coin. Take a look at http://whattomine.com/ for the best coins to mine based on profitability and mining difficulty. Then make your decision. I currently mine in a pool and the pool site's name is http://coinotron.com.