I´m having a hard time fighting against marines and marauders with gate units. In bronze/silver Terran wall, so I can´t attack with few gate units. But after that Terran came back with a mass of marines and marauders and butcher my zealots/stalkers. Zealots are not ranged units and concusive shells make them slow down. What are the correct counter?

Gateway units are pretty weak against marines and maruders. It might be worth going 2 gate robo to get out an early  Colossus.  I dont really play protess but that is what my friend usually goes against Terran.  Or getting some high templars with psi storm eats marines like crazy and can feedback medivacs.

Yeah, you can't counter a mass like that with another mass.  You need to either get colossus or psi storm. 
 
edit: wait.  how early game are we talking here?

if they are walled into their base keep them there. dont let them expand. but dont trt to push in with zealots stalkers. get cannons and build up to colossus or immortals or templars.

3gate into Robo timing attack w/ proxy pylon.
 
gg

I find that mixing in a few sentries with guardian shield goes a long way towards nullifying marines.  You can also use force field to break up a MM ball which can help in larger encounters. 
 
Still, timay is right.  Gateways units are generally pretty weak to Barracks units (especially marauders).  If you think your opponent is going heavy Barracks you should try to get to Robo tech or psi storm.

Let´s say 3gate and robo. How much Stalker, Zealot and Immortal I need make each?  

And let´s say that I encounter a group of 6 marauders + 10 marines in the road to enemy base. I attack, run? Who focus the attack? Zealots are almost dead before reach the marines and marauders.  

Upgrades, do upgrades in early game? Invest in canons to wall or more units?

" I find that mixing in a few sentries with guardian shield goes a long way towards nullifying marines.  You can also use force field to break up a MM ball which can help in larger encounters. "

" @Safety_First said:

" I find that mixing in a few sentries with guardian shield goes a long way towards nullifying marines.  You can also use force field to break up a MM ball which can help in larger encounters. "

Yeah, I never training using sentries and force shields.  "

@Spectreman

" Let´s say 3gate and robo. How much Stalker, Zealot and Immortal I need make each?  And let´s say that I encounter a group of 6 marauders + 10 marines in the road to enemy base. I attack, run? Who focus the attack? Zealots are almost dead before reach the marines and marauders.  Upgrades, do upgrades in early game? Invest in canons to wall or more units? "

I have a question about how to apply multiple force fields . If I press shift and target the places of force fields, the sentries only do the force field after kill the enemy which is firing at. 

It would be cool if there was a display for how many Force Fields you had available in your control group, like a number on the hotkey somewhere.

MMM can actually be dealt with Gate units in the early stages of the game quite easily if you use your sentries wisely. FFs and guardian shield are very handy. Immortals are essentially the best unit to start building after you have enough resources to mass produce from all your gateways (3-gate+robo is probably the most reliable build order for this tactic), then after that, yes, colossi. Immortals soak up loads of damage though so don't underestimate them even against an MMM force. If your still 1-base in a battle, be sure to always split the enemy army using FFs on the ramp but let a few units into your base before you plop down the FF cause that way you'll be both protecting yourself and killing half his army in the process.

One sentry for guardian shield + immortals + upgrade in armor have improved greatly my PvT. Thanks.

" @Safety_First said:

" I find that mixing in a few sentries with guardian shield goes a long way towards nullifying marines.  You can also use force field to break up a MM ball which can help in larger encounters. "

Yeah, I never training using sentries and force shields.  "

2 gate robo 
keep early pressure but dont commit to attack, just lurk outside their base making your presence known 
expand 
add more gates, research charge 
have about 4 sentries with a similar amount of immortals before committing to an attack 
keep an obs in their base, you need to see if theyre planning drops

It's all about the force fields man.  The fucking force fields.
 
(I'm a Terran player)

You need more sentries, multiple for guardian shield and force fields. Hold down f and click to place multiple. Toss up a replay and I'll take a looksies.

keep your zealots and sentries on a different hotkey to your stalkers 
keep zealots at the front 
may sound obvious but if you keep all on one hotkey zealots tend to get stuck behind and do nothing

In smaller numbers, chargelots can decimate mm balls especially with some stalker support or some nicely placed forcefields to stop kiting. In larger balls, you'll need to split the ball up (as other's have suggested) or you'll need to tech up to Colossus or HT.

Hallucination seems pretty good. Sentry+Hall Colossus in early game and Terran run away.

" Hallucination seems pretty good. Sentry+Hall Colossus in early game and Terran run away. "

With Hallucination sentries can do any unit, even before be tech. They take the double of damage and last for only 60s, but battles take seconds.     

You can handle marine marauder with proper forcefield placement. Most 'safe' protoss build is 3 gate robo. Try pushing with the immortal and 1 sentry. If your not doing that get more like 4 sentries.

Well, we can't really tell you what you're doing wrong if you don't give us a replay, can we? 
 
Ok. I'll try. 
 
So, you're claiming that you have problems with bioballs. My advice:
 
1.Watch two of your PvT replays. Center your screen on the corner of the map so you don't get distracted
by units/buildings/battles (the less important things).
2.Watch the whole replays with the "production" tab opened. Stare at it all the time, and make sure that there's
always at least one probe making. Also, make sure that you're never supply blocked. Take notes if
any of these points is neglected.
3.Do this for every one of your replays until you've never forgotten a probe or a pylon.
 
Now that you can macro and are in the gold league, you can start to think about improving your build orders.

zealots and force fields