There are many 'Uses TO the soul Ring; there are many "wrong uses to the RING!
Lets discuss proper uses starting with just good habits to use when you buy it... If you have no way of escape and you still have like 200 health
just use it and hit them with a spell in spite of them ^.^ which costs you nothing and hurts them
Also another good habit while laning is when you have full health and are playing heros that can cast easy harass and are doing fine on regen items or have little to worry about is to use your soul ring for poking
-s-s-ss-s-s
Soul ring can be very useful on broodmother and earth shaker and i recommend always getting it on a dual lane brood sometimes you can skip it if you wish on an offlane but i still like to grab one on her...
Soul ring provides good regen in both early game mana and health..
Ect. To be continued