The most secure way to gain from having bitcoins, with no risk at all is to lend them on bitfinex.com.
Use the code 5l4wLVc4LW when making a new account for a 10% discount on all fees.
Do you have a guide on the lending process? The website is confusing with all the investing jargon.
After you get use to it it's quite simple. On the total return swaps (the lending part of the site) you select usd, btc or ltc and go to Offer swap. There you set the period in days, the rate you want to lend funds for (in precentages per day) and the amount you are offering and then click offer swaps to post your offer.
It's useful to use the autorenew function too, witch automaticly post your offer with your terms. You also have the Flash Return Rate (if you press options) witch is a variable interest rate based on the demand and offer. This would be the basics you need to know to get started.
Also you have three wallets, coresponding with the three sections of the site, so first you need to transfer funds in the coresponding wallet. For the lending part the wallet is "deposit". For transfering funds between wallets you go to "Manage Wallets".