How do I delete temp and cache and have more space on rom and ram?

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Windows Central Question

how delete temp and cache and have more space on rom and ram?

Hi, I just bought a lumia 640 LTE with WP 10 and I used to have androids phone

on my old android I had app like android assistant and similar apps. whit this kind of apps I could delete temp and cache and have more space on rom and ram

1st question: do I need to delete temp and cache and have more space on rom and ram on my WP? How can I boost my lumia 640? because it is so slow when I use my favourite app: Deezer

I found some similar app on the store, but they seem rubbish.

2nd question: can I trust the app "Device Diagnostics HUB"? it asks too much information. is it dangerous to follow the strange instruction of this app?

thank you