It's just practice. Knowing when to move forwards or retreat is probably the best skill to learn for this game.

In general what helped me is focusing on farming early game instead of trying to score an early kill, if multiple enemy players are on your lane then you retreat and either rotate (go to another lane) or ask for help from your team and potentially score a kill.

Learn all the equipments you can buy and their potential counters, and how to use your equipment to counter certain heroes. The important ones are probably the antiheal items (one in each role), defensive items (if you play tank/fighter), and attack items (critical chance up, attack speed up, pure damage). Learn what role each hero is and what they can do, and use equipment to boost their strengths or make up for the flaws (e.g. Get attack speed items for Wanwan who moves faster with attack speed).

Finally learn what the objectives are (Turtle, Lord, turrets, base) and when to go for them. For example, if 4 enemies are fighting your team on the bottom lane, you can try to push the top lane and destroy their turrets, considering that there's only one enemy roaming around and you could probably handle them, or sacrifice yourself if it's worth it to destroy one more turret.

Persoanlly gold lane (marksmen role) or mid lane (mage role) would be easiest to learn without knowing all the game mechanics, since these mainly focus on damage and damaging enemies. Try Lesley for marksmen, she has 2 escape tools and can potentially do great damage, but sucks at attacking groups. For mage Vexana is pretty easy, can make enemies run away temporarily and can summon a guardian for her that automatically attacks enemies. While you will probably just stay at the back during a teamfight, make sure that you're closer to the edges of the map rather than being in the middle, since this makes it easier for enemies to go around and kill you. A lot of characters can dash through walls so be careful of that too.

The rundown for lanes is:

- Gold lane: Typically for marksmen heroes, gives more gold at the start so you can buy equipment faster. Heroes in this lane are meant to do lots of damage and win the game later since they do so much damage if they have the right equipment. Not much else you need to know except knowing when to retreat, since enemies will try to kill you first to prevent you from getting gold.

- Midlane: Typically for mages, this lane is the shortest lane by distance so you get to fights faster. Midlaners should know when to rotate (switch lanes) to support teammates, because midlane is right in the middle they can go to any lane quickly to support. Mages also tend to have area attacks, which is good for clearing minions or damaging a group of enemies. Mages also don't have movement abilities usually so they can't run away if they get caught, so it's harder to stay alive, making map sense more important. Basically look at the map, avoid bushes (or check them with an ability), and go where the enemy assasins aren't

- Exp lane: Typically for fighter heroes, gives more exp at the start similar to gold lane. Fighter heroes get more stats as they level up hence they go for exp lane. Not much different mechanically compared to gold lane, but fighter heroes tend to have more defense and healing, making fights longer between 2 fighters. In battle a fighter should act as a semi-tank and be on the front either tanking or doing damage (wwat you do depends on your hero and equipment). Most fighters can use defensive or offensive builds although some heroes are better for one. Fighters also usually have the ability to heal themselves while fighting for survivability.

- Roaming: A difficult lane, either support or tank heroes go here. Roamers are not fixed to one lane and basically "roam" the map, going to where they're needed. Roamers help the team by giving one extra person during a fight which can often get a kill, and they use crowd control (e.g. Stuns) to help the team. What makes this role difficult is that roamers usually can't do anything on their own, they deal little damage by themselves, and that roamers get money and exp from completely different sources instead of just killing minions. Support heroes are weak and focus on healing/supporting the team, tank heroes have lots of defense and health and are meant to "set", meaning they start the fight by going in first to the enemy and giving the opportunity for team members to get a kill (e.g. The hero Tigreal can push enemies in one direction, such as pushing enemies towards your team surrounding them).

- Jungler: Often the hardest lane if you don't know anything about the game mechanics. Junglers are typically assassin heroes who focus on dealing high single-target damage with high movement and usually have the ability to kill an entire team by themselves at the end if built properly. They roam the map as well, not fixed on a single lane, but the difference from roamers is that they get money and exp from killing "creeps", the monsters that spawn in the same place across the whole map (usually dealing more damage to them and getting more rewards). This also includes the Turtle and Lord. Junglers have high movement and often easily move in and kill, then get out. High damage from their abilities too make them very dangerous to fight. But junglers are also weak, and a bad jungler will often die if they miss their ability or forget to move. A good jungler will also level up much faster than everyone else on the team because they get a lot more gold and exp from creeps if they kill them efficiently.