Give me some rare DOTA techniques and tips like how to kill roshan with low LEVEL, etc.....in order to win games. Thinking that Google will be your best bet with this.... also starting a post with PLEASE vs just GIVE ME might go across as not being demanding Depending on how low of level you are referring to, you MAY be needing a cheat for the game, that is if mathematically & strategically there is no probable way of a lowbie dodging damage and TAKING down a specific monster etc to give a god mode ability or insane damage output that is beyond what a normal character would have at the low level.There are some DIFFERENT ways to kill roshan with low level. Some single heroes cab finish by themselves. For example, Troll WARLORD with his Ult and Ursa Warrior with a Vladmir's Offering.
If fighting roshan with 5 heroes in level one, afford harms in turn until roshan die. But you might analyse your team's attacking ability.

Asides from Ursa, some of the better heroes for soloing Roshan from levels 6-10 are:

Enigma: Using Eidolons and a Medallion of Courage. You may also need a Soul Ring to keep your mana pool up. The idea here is to cast cast Medallion on him to reduce his armor to greatly increase your Eidolons' DPS. As MadCom mentions below, Medallion doesn't proc Roshan's spell shield so you don't have to worry about him blocking it.

Venomancer: Using Plague Wards. Create a wall of wards between you and Roshan and you should be able to right click him to death.

Lycan: Using his wolves and a Vladimir's Offering. Shift aggro appropriately to tank damage.

Lone Druid: Using his bear and a Vladimir's Offering. Shift aggro appropriately to tank damage.

Troll Warlord: With points into Fervor and Battle Trance and either Vladimir's Offering or a Helm of the Dominator. It's also recommended you switch into melee form for faster attack speed, health, and damage (also, Vladimir's Offering wouldn't work if you were in ranged form anyways).