element>element
for example : div > p
Selects all 
elements where the parent is a element
element+element
for example :div + p
Selects all 
elements that are placed immediately after elements
element1~element2
for example : p ~ ul
Selects every  element that are preceded by a 
element
see this like for all css selectors:
https://www.w3schools.com/cssref/css_selectors.asp
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solved Which patterns used to select the element? [duplicate]