As a battle royale game where you have to fight against the whole world to become the winner, PUBG Mobile is not a very new player friendly game. The game does have bots for you to play with at the start. However, as you rank up, you will soon find out about your limit and stuck at a certain rank with no clue of how to improve your skill in the game.
Today, PUBG Mobile just released a new feature called 'Brothers in Arms' to give higher rank players a chance to help players at lower ranks and receive exclusive rewards, including the 'Special Trainer' title.
If your rank is Gold or higher in Dou or Squad in the current season, you can sign up as a veteran to help other players grow better and win rewards. If you are a player who is looking for a way to become better at the game, you can sign up to be a rookie and find matches with players who are better than you to learn from them. But you can only do that if you have never reached Ace tier before and currently have the rank between Bronze V to Crown I.
There are daily missions and weekly missions in 'Brothers in Arms' feature for players to complete for rewards. Also, note that this feature only available in Classic mode.
Also check out: PUBG Mobile: Player Suicide 300 Times In-Game To Find Out This Secret.