In sentences that are a bit tricky, the words 'に' and 'へ' can often mix together, but there are some important differences to know:

1. Where You're Going:

   • Both words can show direction.
   • 'に' feels more like a specific place you are heading to.
   • 'へ' feels more like you are moving toward a general area.

2. Ideas and Dreams:

   • When talking about ideas or feelings, 'に' is better for stating situations.
   • 'へ' is more suitable for big goals or dreams.

3. Formality:

   • 'に' sounds a little more formal.
   • This makes it a good choice for writing or polite talking.

In the end, it’s all about the little feelings you want to express!