What is the difference between ч, ш, щ and between х, р?
I kinda understood the differences between ш, щ, but not between these 2 letters and ч, and the difference between х and р

Question

What is the difference between ч, ш, щ  and between х, р?
I kinda understood the differences between ш, щ, but not between these 2 letters and ч, and the difference between х and р

Answer

ш - like sh in shame
ч -  like ch in chain
р - more like Spanish 'r' 
х - like Spanish 'j' or like English 'h' but more aspirated

Answer

Wikipedia has a detailed information on phonetics with examples from different languages:
https://en.wikipedia.org/wiki/Russian_phonology#Consonants
/р/ -- https://en.wikipedia.org/wiki/Dental,_alveolar_and_postalveolar_trills
/ч/ -- https://en.wikipedia.org/wiki/Voiceless_alveolo-palatal_affricate
/х/ -- https://en.wikipedia.org/wiki/Voiceless_velar_fricative

Here's a very useful YouTube channel:
https://www.youtube.com/watch?v=zltpo15toe0&list=PLlmgeS8moU5ivxZCWJogsaxvxSJ-Mv-83

Answer

@Victoria, 
Try to listen to these words and you will see, that there is a huge difference between those letters. 
1. Человек(ч)
2. Прищепка (щ)
3. Пешеход (ш)
4. Походка (х)
5. Ресторан (р)

Try to put these words in Google Translate

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