1. Explain it simply
向 and 往 point an action in a direction.
Put 向/往 before the direction, then the verb: 往 + direction + verb.
The direction goes in the middle - say 往前走, not 走往前.
向 and 往 are often interchangeable for directions.
2. Show examples
往前走。
Wǎng qián zǒu.
Walk forward.
往 + direction + verb
向左走。
Xiàng zuǒ zǒu.
Go left.
direction in the middle
一直往前走。
Yìzhí wǎng qián zǒu.
Keep walking forward.
with 一直
3. Share a tip
Put the direction between 向/往 and the verb - the verb always comes last.

