Italian is not a difficult language to read and pronounce. Nevertheless, so often I hear my students pronounce 'ch' in perché in an English way like 'ch' in cherry. That is a very common mistake. Here is a short tip to remember how to pronounce the sound /k/ in Italian. Memorise this in your head and apply it when you are unsure.
/k/ sound like 'kind'
| Chi, che | l'h c'è. | The 'h' is there |
|Ca, co, cu|l'h non c'è più. | The 'h' isn't there |
Now try and read these words: chilometro, chele, casa, corpo, cubo.
Once you know how to read and write these words, your brain registers them as an example and it will be easier to write other similar words.