Most players who stick with World of Tanks are capable of looking at the mini-map(sometimes) but few can truly understand what all those green and red dots mean. Knowing where you should be on the map based on the known locations of enemies and where you teammates are positioned is a difficult task. There is no definite guide or way of telling you “where you should be” since every match is different and every map plays differently as well. There are however a few small tips you can use as a rough guideline to sooth your mini-map woes.
In a scenario where you notice a hole in the enemies or your own team’s line you might be tempted to move to fill or attack that gap. In some cases this can be a very good idea if you catch the enemy off guard or are flanking enemies already under attack. On the defensive side by you moving to cover a hole you could possibly stop a scout or an advancing force from moving through unseen. However, in most cases you do not need to move over to cover a hole in your line or attack that “wide open” gap in the enemy defense and here is why. On the defensive side on most maps you do not need to move very far to “cover” a hole since you can use your view range to your advantage and cover multiple areas. Instead of moving over to a location alone and then being torn to shreds by multiple enemies can be fixed by setting up further away and closer to friendly tanks. This also has a benefit of enemies pushing to far and then being flanked from multiple sides when your other teammates realize.
On the attacking side it depends on if you are alone and what tank you are in. If you are in a scout tank or mobile tank then darting through an opening and getting behind the enemy can prove to be useful. However, attacking with a non-light tank or less mobile medium can result in you being picked off quickly without accomplishing anything. Generally if it looks open and to good to be true then it is. Exploit these openings when you can help your teammates in an area nearby or if you know you can get in and out fast.
“Lemming Rushes” or more specifically your entire team pushing down one side of the map while ignoring another is a common occurrence in World of Tanks. Choosing between covering the forgotten flank or going with the flow is a simple choice if you think about it this way. If your team is rushing one flank to begin with it should hint that a lot of the players are not very “map aware” and will need help if they encounter any decent defending force. Helping them by joining the lemming train *but* not fully committing to it is in most cases the best option. Start out by telling them that “we need to push hard” and then push out to a spot that you can help them pick off the first few tanks and get the ball rolling. Then you can start to slowly move out towards the weaker side and/or back to your base to prevent the enemy from capturing your base quickly. This way you are not left defending against a hoard of enemies in the first few minutes while the “lemming rush” on the other side stalled at the first enemy tank they saw.