There are too many types of tree data structure like BST,AVL-tree,red-black tree, segmented tree,treap interval tree…
In what order this data structures should be learnt they can be learnt individually or the do have some connectivity.
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From Competitive programming point of view : Learn segment trees and BIT first . You’d hardly ever need to know the rest of them (mainly because there are for ex, maps and sets in C++(which are implemented through these data structures only))
Otherwise If you just want to learn them for your knowledge order doesn’t really matter i guess.
Hope this helps!
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