Whats best alternative for c9.io

I mean, Can i use my local command line or is there any other app?

Yes, you can certainly use your local command line interface. At least, that’s what I am using to learn back end certification.

If you search around the forums for “cloud9” or “c9” you’ll see lots of discussion of alternatives to cloud9. Moving forward, FCC will no longer be recommending cloud9 in favor of Glitch.