Trop means "too" and goes straight before the adjective: trop grand, trop cher. Assez means "enough" and ALSO goes before the adjective, unlike English: assez grand is "big enough". Before a noun both add de: trop de monde, assez d'argent.
Examples
- Ce pull est trop petit.
- This jumper is too small.
- La veste n'est pas assez chaude.
- The jacket isn't warm enough.
- Il y a trop de monde ici.
- There are too many people here.
The mistake to avoid
"Grand assez" copies English word order - in French it is always assez grand.
Where this fits in
Colours, clothes & likes, French A1: Name colours and clothes, buy something in the right size, and say what you like and don't like.