What version of Minecraft should i make mods for

[Dijkstra]

I started rewriting one of my 1.7.10 mods to 1.9, then i updated it to 1.9.4 thats ok i guess but know 1.10, should i work on 1.10 now or stick with 1.9.4. or is 1.9.4 and 1.10 so similar, not to many changes would mean I have a 1.9.4 and 1.10 mod.

If Minecraft keeps up the updates at this rate there will be no stable mods packs.

[FireController1847]

I agree with him, I just suggest doing it for 1.10. Not much has changed from 1.9.4 to 1.10, so you should be able to follow 1.9 tutorials for 1.10.