へ
toward, to (direction)
Place + へ + movement verb
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へ marks the direction of movement: 東京へ行きます, "go to Tokyo". As a particle it's pronounced e but written へ; on a keyboard, type he.
With 行く, 来る and 帰る, へ and に are usually interchangeable. へ stresses the direction you're heading, に the arrival, so へ suits setting out, and it's the one you'll see on signs and in letters.
Unlike に, へ can be followed by の to describe a noun: 母への手紙, "a letter to my mother".
It can't do に's other jobs: not what you get on (電車に乗る), not a time, not where something is.
Examples
来週、北海道へ行きます。
I'm going to Hokkaido next week.
夏休みに国へ帰ります。
I'm going back to my home country for the summer holidays.
日本へようこそ。
Welcome to Japan!
これは母への手紙です。
This is a letter to my mother.
次の角を右へ曲がってください。
Please turn right at the next corner.