The letters 'tch' make the same sound as 'ch' at the end of a word.
witch
peach
It can be hard to know whether to put a 't' before the 'ch' or not, but there is a rule that can help.
If there is a short vowel sound just before the 'ch', then put in a 't' as well.
match
itch
Otherwise just use 'ch'.
reach
bench
(The vowel sound in 'bench' is short, but there is an 'n' between the vowel and the 'ch', so you don't need to add a 't')
Of course, there are always exceptions to a rule, and here are three words that ought to have 'tch' but don't!
much
rich
such
It can be confusing but the best way to learn it is to practise reading and writing the words.
Let's give it a go!