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

Не упустите возможность выучить язык, не выходя из дома. Ознакомьтесь с подборкой опытных преподавателей и запишитесь на свой первый урок прямо сейчас!