How to Hide Content?

Can someone kindly teach me how to hide content like download links in my posts? I read somewhere that there is a potential chance someone wouls get in troublw somehow, and all the leaks I have posted don't have any hidden content which is cool for the leeches, but I wanna be like the cool kids who hide their content. Thanks! & sorry if this is the wrong place to post such topic, just in case it is...