Every time I try to ask a smurf what it is that they do so well, I never get an answer. How is it that they can do so well in lane? I've also read we low lvls don't push our advantages when ahead. What exactly does that mean?
Pushing advantages while ahead can mean a few things.
If you have an opportunity to take a turret take it, dont continually recall for no reason and leave it up. It helps your entire team and gives you global gold.
If you're a top laner and you've won lane and taken turret, dont stay top all game. Group take objectives, take dragons, push turrets.
If you're going to try to split push after taking first turret dont continually go top and die repeatedly failing to take the second turret, this slowly throws away your lead. Ward the surrounding jungle, if you notice that 2-3 people are continually coming to stop you just group with your team, you can probably take an objective together.
If you have a lead dont randomly farm jungle or freeze and farm a lane. Push and snowball your lead by grouping and taking more objectives.
Overall game knowledge is the biggest advantage. Mechanics of each champion leads to deeper outplays and small victories in lane.
Cooldown counting tends to be a dominant factor in deciding early game duels.
So for a stupidly obvious example of what I'm talking about, have you heard anyone say anything like "Watch out, 
has ult" or "
already used his Ult, let's engage.
If yes, you should already have a general idea of what I'm going to tell you. Cooldown counting, in a nutshell, is attacking your enemy while their abilities are on cool down, and playing defensively when your own abilities are on cool down. You're ESPECIALLY going to notice this in midlane, where abilities are hyper dominant in expressing a champion's strengths. Did Ahri use her Q to wave clear? Dodge it, use your gap closer if you're Melee or your CC ability if you are ranged, and wail away. Even if Ahri uses her Charm on you at that point, she just burned her Q on the minions, and likely can't do much damage to you anyway. Timed well, you can guarantee good trades simply by forcing fights that the opponent literally can't respond to.
Here's a video of Cowsep bringing using this concept to engage a fight that he is far behind in (It's literally one of the first things he talks about in this video): https://www.youtube.com/watch?v=dfnrKoM9OYA
High-elo players possess more of any/all of these than low-elo players.
Pushing advantages is basically not letting opportunities go to waste. Take the tower when you can, take dragon when you can, farm when you can, even buying when you can, so and so forth.
It is a lot of little things. To explain it requires a lot of time and it involves a lot of variables, so there isn't any one clear explanation to give because it changes from game to game.
In GENERAL everyone knows the basic concept of the game. Killing minions gives you gold, killing champions gives you more gold, killing towers is important because it lets you reach their inhibitors and then ultimately their nexus which allows you to win the game. As long as you play the tutorial or play a few games, you will end up understanding these basic concepts. What makes higher level players better is that they can do these individual things better then you and know how to do it safely.
One example I can give is being able to CS with just auto attacks. This takes a lot of practice and time from the individual, but if you're able to do it, it is almost ALWAYS worth it to not expend mana to finish minions until you're a higher level, trying to wave clear, or have some kind of gimmick that makes it worth doing (like Annie Q refunding mana on kill, or Veigar/Nasus Q giving stacks). Lets say your opponent uses all their mana just trying to kill minions because they aren't good at last hitting. This gives you an easy advantage because you will have mana to use your spells to harass them and they are OOM and can't trade back. In this case your opponent has to basically make a choice. They either need to port back and lose gold/experience or stay there and lose gold and POSSIBLY experience if you can zone them off far enough. This will basically guarantee that you will have the experience advantage so you will hit level 6 first and will be able to turn your level 6 power spike into a kill, snowballing you further ahead of your opponent both gold AND experience wise.
I feel I kind of went off on a tangent, but this is just one example of something that I understand and can execute or if it is being done to me, I know to play back more because I KNOW they will hit 6 BEFORE me and that if I'm too close to them, they will immediately turn onto me and try to kill me. Of course, this scenario was used with the assumptions that you're both mana using champions and both have an actual level 6 ultimate (not Jayce, Nid, Karma), but I feel this is enough of an explanation of one thing of the early laning phase that understanding helps you do better. As you get better, you just know these kind of things intuitively and can do them naturally, instead of having to "waste" time to think about it and you will just "know" that you can/can't do it. Of course some calls aren't 100%, but you usually make those even if they are risky because you're in such a BAD position already, doing it can't SCREW you even more then you already are. Just knowing all of these things adds up overtime and is able to allow you to perform at a better level compared to your opponents, which in turns allows them to usually come out ahead with the W. In general, the only things you can "easily" practice on your own is CSing and learning your champions abilities. Everything else you need to basically experiment with in a live game because each game is different and you will be going against different champions in different games, so the way you will execute something in one game can be drastically different then another one. If you work on all these things, eventually you'll be able to play at a higher level then you currently are at yourself and will most likely be able to look back on it and go "damn I sucked." Oh and just to let you know, you will most likely thing that no matter WHAT level you get to unless you win like worlds, but even then I'm pretty sure you would make mistakes in the game that make you shake your head in shame at yourself.
they do well because they have experience against their enemy laner. thats why they dont answer u.
there is nothing to be said. he has experience with all champions and all sorts of situation because he is a smurf while you and the enemy doesnt.
so the only thing u have to understand is to read / watch videos/pros. and just basically play the game and keep lvling u, and once u are lvl 30 and u keep playing the game u will just get better.
edit: and most of the smurfs arent that good, they look good because they have an edge over the new people. but if u find out about their main, they are some bronze/silver noob that acts hard.
Focus on map objectives. Dragon is up? Get him. Enemy team has 4 bot? Take their turrets.
Oh and use wards.
well, to be honest it just comes with experience and actively learning. A lot of things don't have a straight "yes/no" do "x/y" answer. For example, I know I'm stronger than X champ all things being equal, should I try to all-in them? Depends... what summoners do they have, how much mana does each champ have, have either of you used any abilities recently, who is the jungler for each team, what time is it(ergo where the jungler is likely to be) etc.
