I have to write down what I have learnt, or I will forget it.
After a noun head, the following can ensue in a noun phrase.
1. present participial clause
2. past participial clause
3. to-infinitive clause
4. adjective phrase
5. preposition phrase
The 5 elements above can be both defining and non-defining.
Moreover, only 1, 2 and 4 can be shifted to the front of the noun head.
However, the problems are they are not interchangeable, and some of them can only be used in particular cases.
Do you really need to worry about so much detail if you find it confusing?