Help with Templar Assassin!

This might be a bit long.

I play TA every once in awhile, so I think I know a good bit about her playstyle. There are a few ways to level her up. If your just starting, I would recommend something like Q/E/Q/W/Q/R/Q/E/E/W/R/W/W/E/U/R. The main difference from the standard TA build is switching out maxing Meld after Refraction ASAP with getting 2 extra levels in Psi Blades, because it's easy to mess up a meld attack with only one level in E. Once you get more comfortable with blink meld strikes, you could probably switch to the standard build. Meld is really powerful, but if you can't land it then it's a waste.

Midgame is your game, don't chase pricey items early on. The only exception that I can think of is Desolator. The highest costing items otherwise should be in the 2000 range. Think Blink Dagger, Crystalys, and your boots of choice(Phase or Treads). Of course, get a Bottle as early as you can.

One thing to think about as a TA player is Rosh. Meld is such a good skill for taking out rosh, combined with a good carry.

Some(most) people see TA as a BKB hero, but I disagree. It's a matter of opinion, I wish I would have gotten it sometimes but other times the gold was certainly better spent when I put it into a fast desolator.

A couple things about Meld. It is so good, SO GOOD. The only reason not to get it after refraction is if you can't land it without extra range. First off, a lot of extra damage for one attack. The debuff is only applied for the extra damage, so your own attack damage will not get magnified for the initial attack, but the 200 will. It has the fastest fade time in the game, at 0.001 second fade time. Getting stunned or damaged will not break the invisibility, but any ability that forces you to move does. Also, use it to disjoint stuns, or any projectile you don't want hitting you. It works very well.

For the endgame, the 2 big items will be a Daedalus, Manta Style and a Butterfly. AC and Heart are also good if you need survivability.

Last but not least, Psionic Trap is a great pub ability. All you need is the first set of wards, and then you can keep track of the runes yourself. Place them on the rune spots, in the Rosh pit(if the enemy team has an early Rosh hero, then you need a rosh trap at about 10-15 minutes. Maybe earlier if they have an Ursa), and anti-gank spots. Put them in choke points, so the enemy doesn't have a chance to go around them. As the game wears on, place them in the jungle, in spots around lanes, around the ancients, in the secret shops, and save a few for chasing. TA is better at keeping track of enemy movements than most pub supports in the late game.

Everyone else made good points. The last thing I have for you is an extension on my talk for Traps, here are good places to lay them.