Here we assume you are playing one entranced map of each player like lost temple or hunters which of these are maps widely used in multi gaming.

Build scvs and locate your first supply depot to your entrances or cliffs near and build barack near your supply which will help to close your entrance too.and last you can make 2. supply near your barrack and supply.These tactics is widely used and generally succeful for rusher protosses or hyrda attacks from zerg.After you close your entrance you can do any tactic without any fear of strike from your opponent and keep in mind that always place some scv s near your supply depot at your entrance when any attack occurs your base from entrance your scvs will repair the supplys or barracks when you are calling reinforcements.After setting the entrance you can make some different tactics in order to your aim against your enemy.If your prior aim is to stop your rivals economic flow we suggest that make firstly war factory and then directly build starport to make vulture drops against your enemies probes scvs or drones.But this tactic is generally used against protoss because the dragoons are very clumsy before sight range upgrade if you can make an assault at this time period you will be very adventegeous because the vultries are superior fast and harmfull against the probes only 4 (early)drops can kill lots of probes and this means the beginning of the fall of your rival.The other alternatives are dependent of your aim again if you want to make your opponent a slave you can apply terran push tactic which will be very exterminating tactic against amateur protosses.Make 1 or 2 tanks add them 4 marines and 3 scvs and go very early and do not forget minening by your vultures while your scvs are building turrets and supplys at the warfare zone.To be succesful with this tactic your APM must be really at high values because thistactic needs extra Mouse clicking.At the beginning i said make slave but be carefull there are lots of protoss which will never accept slavery!.

Lets talk about defating to zerg with terrans here the micro is very important do not work for making lots of tanks because the production rate is very low compared with the swarm zerg essipecially you are struggling mecha units you would defeat easilly.Make against the zerg, marines for hidras mutas (upgraded off course),make firebats for zerglings but not so much and of course medics.Here the academies upgraes are very important.and do not forget making comsat and turret web on your base because there is always a tendency to spawn lurkers by your renegade rival. Lurkers and guardians are superior to terran micro units so be carefull esspecially these two units and if there are ultras on battlefield and you do not have vessels more tank sor mecha units we suggest left the game J.

If you are playing an islanded map (there is no land connection between bases.)Making battle cruiser fleet will be very usefull to defeat the zerg.But this tactic has big disadvanteges first very expensive tactic and second it will be really expensive if you do not keep some resources for your defense!