@olivedev Why don't you try to install it yourself? I published a little guide that helps you do just that 😄
This forum is a good way to get help if you find yourself stuck somewhere.
which is the best to install redis? on local host or on hosted ip.
@vivek-tailor depends if you want other people to be able to see your forum. The easiest method is getting yourself a VPS through someone like digital ocean, links in my signature. And install everything on there.
There's no difference in having your Redis server installed on the same server as NodeBB, or on a separate server. Conventional wisdom suggests that a local Redis server will be faster (near-zero latency), and potentially more secure (no chance of intercepted connunications from app->redis).
But really, they're about equivalent.