Tinker

Boush the Tinker is a ranged intelligence Hero who relies heavily on his assortment of nukes for ganking and pushing. While he does have rather low stat gain, he is able to reset the cooldown on his abilities, which in conjunction with Boots of Travel gives Tinker global mobility rivaled only by Nature's Prophet, which combined with his two high damage nukes, Laser & Heat-Seeking Missile make him a constant threat. Tinker abilities' mana costs are very high, however thanks to his ultimate Rearm, and Boots of Travel, Tinker can simply to go back to base to refill health and mana, Rearm and go back to the lane to push or gank once more. Acquiring said boots early with a level advantage is key to success, considering he is lackluster without them. With the right item, mana management, and ability management, there is little that stands in the way of this spamming hero.

Tips

 * Laser is an extremely powerful nuke that ignores magic resistance due to being a pure damage spell. Use it as primary source of damage.
 * You should always start with a point in laser, as the blind effect (gives opponent 100% miss chance) makes it hard for the enemy to last hit creeps as well as providing minor harass and can be used to last hit for yourself when you are about to go home to regen.
 * To maximize the amount of farm you get in lane as Tinker, be on Radiant side middle lane, have a support ward near the ancient or the dire medium camp near the river for vision, and stack the ancient camp every minute. Max March of the Machines first and start clearing out the camp at level 5-7 to ensure fast Boots of Travel, the primary item on Tinker.
 * Heat Seeking Missiles has a really long range. With rearm, you can spam a barrage of heat seeking missiles as to harass enemy heroes.
 * March of the Machines is a perfect farming tool. It's a bit tricky to aim though. You can overlap several March of the Machines using Rearm to deal massive area of effect damage. March of the Machines deals damage through magic immunity and damages siege creeps.
 * Bottle is a great item to have on Tinker, even if you're not laning in middle lane. It decreases the time you're in the fountain and increases the time you can stay out of base. It can also be used to regenerate much faster in fountain for when you are teleporting back and forth with your Boots of Travel. Even when you get enough items so that there's no longer space for a bottle in your inventory, keep it in the stash and use it for regen while in fountain.
 * You can stack commands by holding shift to prevent unintentional Rearm interruptions. The Tinker will perform stacked commands right after finishing Rearm.
 * Boots of Travel is a key item on Tinker. Used in conjunction with Rearm, it allows you to teleport to any tower, lane creep or summoned creature, allowing easy global interaction.
 * After you have acquired your Boots of Travel, purchase a Soul Ring as it can be used every time you rearm to boost your mana pool by 150 every rearm, effectively giving free rearms a level 6-10.
 * Stacking the ancient camp, then taking it out with March of the Machines can provide significant gold income for Tinker. Get a support to stack it if they happen to be nearby, and stack it yourself if you are running past it, pull at the x:53 mark.
 * Consider getting a Blink Dagger, as it is a very powerful tool to avoid dying. When teleporting into a seemingly empty lane, the enemy has absolutely no chance to catch you if you shift queue up a blink into the trees before using March of the Machines and Rearm. The range on March allows you to be in the trees with no issue as it will still hit the lane creeps at no danger to yourself.
 * Do your best to get Boots of Travel around the time you hit level 6/7 by making use of the ancient camp and farming the lane effectively, your goal is not to gank lanes and help out allies, just get your Boots of Travel so you can start being a global power house. You should purchase Boots of Travel before Soul Ring, as Soul Ring offers limited use if you don't have the option to freely rearm.
 * Teleport into fights whenever needed. You probably put four points into March of the Machines, but you should have 3 or more points dedicated into Laser and Rockets by the point you participate in fights.
 * When you start to get gold, consider getting a Dagon as it works great with rearm and the ability to get infinite mana through teleporting to Fountain and back into lanes. Can be used to great effect if you manage to kill enemy disablers or silencers before they can do anything to you, as they tend to have lower strength gain than other heroes.
 * The Tinker can permanently disable and kill enemy carries in the late game phase. Simply repeat "Scythe of Vyse, Missile, Laser, Rearm" cycle till your target is dead. Make sure you have sufficient mana pool and you're performing everything quick enough. Try to avoid stunstacking though, do not reapply Scythe of Vyse until the target is about to get released from the disable.
 * Ethereal Blade is also a very useful pick-up on Tinker. Although it counts more as a luxury than anything else, it will amplify the effects of Dagon and Rockets (but not laser, since it's pure damage) by 40%, making them do 1120 and 455 damage (when fully upgraded). Few heroes in the game can withstand a combo of missile, ethereal, laser, dagon, rearm and repeat. Timed properly, the combo (fully upgraded with 125 int, after 25% magic reduction) does 1842.5 damage. Ethereal Blade should be reserved for after you got Blink+Dagon+Hex.
 * Tinker is an extremely mana hungry hero, so try not to throw your spells around too much before you get a sufficient mana pool. Don't excessively rearm for no reason, and avoid being stuck at 0 mana after using march of the machines and wanting to teleport home, because waiting for mana to regenerate earlier on might take a while.
 * When facing auto attack-heavy heroes such as Lone Druid and Ursa, it may be wise to build Heaven's Halberd. In conjunction with laser, you effectively can disable auto attackers up to 6 seconds for melee heroes and 7 seconds for ranged heroes. Adding Scythe of Vyse up on this brings a disable of 9.5-10.5 seconds. Using Rearm properly allows you to completely shut down certain heroes, as it refreshes the cooldown of both these items.
 * March of the Machines is an extremely powerful anti-push tool, as the enemy can't avoid the damage if they wish to destroy your towers or barracks.

Trivia

 * The Tinker's voice actor, Harry "Hal" Robins, also voiced Dr. Isaac Kleiner in Half-Life 2 and the scientists of Black Mesa in Half-Life. Many of Tinker's voice lines reference characters and events from the Half-Life universe. In addition, the name "Violet Plateau" is quite similar to "Black Mesa," and the events described in Tinker's backstory are remarkably similar to the events of Half-Life.
 * The Tinker's alternate/fun name in DotA was "X!!", name of a professional DotA player.
 * Tinker's line "I tink! Therefore I am!" is a reference to the philosophical statement "I think, therefore I am." proposed by René Descartes. Its original Latin words are "Cogito ergo sum."
 * Tinker's line "Tinker, failure…Soldier…Fie…" is a reference to the 1974 spy novel Tinker, Tailor, Soldier, Spy by British author John le Carré about George Smiley (who was played by Gary Oldman in the 2011 film adaptation).