Zerg Vs Terran early game questions

I mainly come across this problem with Terran, but Protoss also fit the profile as well.
I am looking for any tips on early game mineral line harassment. About 7(give or take) minutes into the match.
I usually get the upgraded speed for lings with my first 100 gas, shortly after that mutation is complete I send roughly 14 zerglings straight to an opponent's mineral line. I retreat upon sight of a force that would otherwise eat my lings alive, rinse and repeat.
The foolproof method to stopping this, is to wall your base off. And that's where I need some advice.

What are some other zerg strategy(s) you use to harass early game? Particularly aimed at wall in bases.

 

if you really want to harrass you gotta do it before the wall in. For terran BaneBust with speedlings to his mineral line is best. For protoss it all depends on when they get their pylon and gate. If they 9pylon/12gate a 6pool can work. Usually i pull 1 drone to scout as the game starts, and have that drone attack the pylon nearest the game to weaken it. If you power down their gate usually its GG, but it can be semi micro intensive to do effectively. Going after the mineral line sometimes isnt always best.

Last thing you could try do is Hatch cancel into crawler by their wall followed up by lings and more lings. Its risky and funny when it works.

 

What is hatch cancel?

 

I's when you cancel a hatchery...

It's basically exploiting that you get creep just by starting a hatchery - if you cancel it the creep remains alive for a while and you can build on it. It's the foundation of cheese crawlers and the "release the broodlings" strategy they're fun.

 

Almost forgot to say. Speedlings to fast mutas is a pretty standard harrasment build due to the high mobility of both units. you only need about 5-6 mutas to continuously harrass your opponent. Pretty simple to do as well off of 1 base around 7 minutes in. Get a 9 gas with first 100 get speed upgrade get another hundred and tech to lair. while teching lair get your 2nd gas and put 3 drones in it once its finished. From that point once lair finishes spire and then stock minerals and gas till its done. Then poof lots of mutas.

Its important to harass them with the lings though to keep attention away from what your doing. Also drop the spire off to the side in case of comsat. Or if you really want to keep it a secret spew creep from one of your earlier overlords in a random area and drop the spire on that. If all goes well transition into broodlords/corrupters. It never hurts to get around 5 infestors either.