Offlane is one of the most important positions in the game and plays a special role in it. It performs many different functions that make a huge impact and decide the outcome of the game. It takes the 3rd position in the game, because it basically doesn't require a lot of farming. Stands with the 4th position, against the enemy kerry and his full support. The game on this position is very interesting and exciting, and in addition, does not require a very high level of play, so I suggest you to understand it in detail.

What are the tasks of an Offliner?

Most of the time, the offlaner doesn't need a lot of networth, so his task is to defend the line, gain the necessary items and level. Also, usually the third position is stronger than the first, so it's much easier for him to dominate the line and kick out the enemy kerry. A good foursome can help with this.
He is also often the initiator of tanks in many fights, but he can also completely replace the kerry if he has a bad game or fewer options. Their spells, often allow you to create a good fait and win it, or deal a huge amount of damage, thus kambecking the game.

Early game

The Offliner must control the line, preventing enemies from gaining experience and gold. It is important to use his abilities to damage enemies and make them retreat. Also, he should not forget about his own farming and experience, buying items and pumping abilities.

Late Stage 

As mentioned above, it is very important to be able to initiate fights correctly, because the outcome of any fight directly depends on it. It is important to play every game to the end, because the enemy can always make a mistake and get under your ranged attack. Earthshaiker, for example, can easily deal a huge amount of damage with Echo slam and regain the initiative for your team.

Communication

An important part of the offlane game, because given your abilities, it can increase your chances of winning. Proper communication will always help you to build a fight intelligently, and coordinate your allies in it. Take this into account, and never play with a mute.