Razor is a great hero in Dota 2, whose main attribute is agility. A very strong hero, capable of winning a lot of line. Played on many cow positions, on each of which plays well. The hero is good for beginners, because, does not have complex abilities, and strong enough on the lane. I propose to break down his abilities in detail, and determine the pros and cons.
Pros:
The hero unleashes a charge of plasma around him that deals magic damage every time it passes through an enemy. It also slows down the enemy, and allows you to catch up to those who are running away from you. A good ability that allows you to control creep killing as well as farming the forest.
A very strong ability that counters many kerry heroes. The hero binds himself to the enemy, sucking all his damage and adding it to himself. Works great against kerries that have a huge damage output. It can also significantly increase your DPS.
Passively speeds up your movement up to 20%, depending on your movement speed. Also, when you are attacked, you have a certain chance to counterattack the enemy with lightning, dealing magic damage. This greatly increases your mobility, and allows you to chase enemies for a long time.
Razor's ultimatum ability. A storm cloud appears over the hero and deals magic damage to enemies. It also reduces the enemies' armour, which increases your damage to them. Allows you to pick up Tormentor in solo. A very powerful ability that not only increases your farming speed, but also makes it much easier to kill enemy heroes.
Razor is a very active hero who can heavily dominate his line, and go snowball the map. He is often played in offlane position, where he wins the enemy kerry, breaks the tavern, and goes to spice up his kerry. His builds are as situational as possible, so use other people's builds to help you buy the right items based on your position.