what lane sustain means?

of the world or "WORD?" yes if you don't know what sustain is, you should play bots. Also as this is a majority forum, and you play in mostly english speaking games. Reading english skill tabs champion abilitys and ect... One should know that word and its definition. Since even though I'm bronze 5 even I know its one of the most core aspects of the game. You can throw my rank up and downvote me all yah want. Fact is I'm right. I'm not acting like i'm some god lcs pro. This is something so simple even I know it. I may not know how to manage my sustain in game as well as other but I know how much of an important aspect of the game it truely is. You on the other hand, have been playing the game in "ENGLISH" and don't even know the word much less its meaning so how could you even grasp what it means in game? So yes as a bronze 5 player I'm suggesting you play in bots to learn before going into a match with 9 other people who know more about the game, and should be more skilled than you, and end up feeding due to lack of game knowledge. Don't take offence when someone actually offers you sound advice. Also before you use the "english isnt my first language excuse" Make sure your not playing a game in full english, in a forum that in in full english. Why? because it makes u sound like you lying. And take that toxic offensive rage somewhere else. All I did is offer advice on the game. This isnt dictionary.com but thats where you go for a definition on a word or in your own words "world"

not quite you need 800 gold since you will buy one already but nah you get decent status to dish some dmg aswell as tank extra trade

Well, yes; of course it does. He's spending 1200 gold after all. He's doing it as a specific strategy. He's putting himself behind later in order to have a bit more of different stats now.

just think is as investment 800G aint much its 5 min of game play to earn (you can always sell them later) but only do this if you have hard time against opponent for whatever reasons

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oh ok cool ! but "wasting" 1200 gold doesnt keep you behind after all?

Well he's dumb.

is a much better investment, or if he wants to build AP.

In other words, he got it so he doesn't have to worry about mana in lane - however, it's a dumb idea, because he wastes so much gold.