I've just gone into Settings > Sharing on my Macintosh running OS X 10.9.5, and turned Remote Login On.
From my mobile phone, I've been able to access my computer using ssh by accessing
myusername@192.***.*.** (and inputting my password), as my phone is on the same wifi network as my computer.
Once Remote Login is activated, could a malicious hacker on another wifi network that had managed to figure out my password gain access to my computer, or is my computer only accessible to people on my wifi network? I am worried that activating Remote Login may be a security risk.