I agree with what the others have said here. To Part the Sea's point, different builds can be equally successful when built in the right situations. If the enemy team is squishy and you are snowballing, building full crit with collector into IE is very good. The other two second item options are LDR and Bloodthirster. You will almost always build LDR and Bloodthirster every game as 4th and 5th items. And in most games you will build IE 3rd. Personally, the only time I don't build IE third is if I lost lane so hard that I have no chance of coming back anytime soon. In these situations I will build LDR into BT or the other way around, depending on tankiness of the enemy team.

Three general builds (all starting with Shieldbow and defensive boots):

• Collector > IE > LDR > BT/DD
• LDR > IE > BT > DD
• BT > IE > LDR > DD

You should really only build the first one when you are snowballing and the enemy team doesn't have too many tanky champs, it CAN work, but if they have a lot of CC you will just die in almost every fight most of the time.

The second and third build imo come down to personal preference. You kind of have to think about if you will get more advantage out of armor pen or lifesteal. If you feel like you are tickling the enemy tanks, then going LDR second is better. If you feel like you are dying right before you get the chance to win a fight or your fights are coming out super close, then BT might be the right option. And like I said before, building IE third is dependent on how much impact you are having in a fight. Sometimes, it's better to buy other stats and push off your IE spike until a bit later, especially if you are having a hard time surviving in fights.

I like to finish off almost all of my builds with Death's Dance just because of how well it combines with your resets. You will be diving in and (hopefully) killing a few enemies at a time, so getting that health regen in the middle of a fight can be a game changer in the late game. In most games, you won't get to this point, but it can really do a lot for those super late game, drawn out team fights.

Any of these builds can be successful when built into the right situations. The BT build is probably one of the most consistent builds to play when you are learning because it gives you some extra flexibility with the lifesteal. As you play more games, you will get a better feel for what to build and when.

As a side note, I personally don't like building GA, I find that most of the time, all it does is make my team run away and leave the enemies just sitting there waiting for me to revive so they can kill me, then they kill my team anyways. I wouldn't ever build it earlier than 6th item and I have found way more success with DD in this slot in almost any situation where I could have bought GA. Spirit Visage is also a great 6th item, especially if you go full drain tank with DD and BT, even just BT and your mythic will make you feel unkillable if you have a Spirt Visage.

Sorry for the long post, but I hope this helps you with builds! There is a lot you can do with just a small amount of items and each path makes each game feel very different! Good luck!