graph TD
L1[Beginner]
L2[Practitioner]
L1 --> B1_1[Get Programming with Haskell]
L1 --> B1_2[Real World Haskell]
L1 --> B1_3[Learn You a Haskell for a Great Good]
L1 --> B1_4[Learn Haskell by building a blog generator]
L1 --> C1_1[Haskell MOOC]
L1 --> C1_2[Функциональное программирование на языке Haskell I]
L1 --> V1_1[Haskell for Imperative Programmers]
L1 --> V1_2["Функциональное программирование (весна 2022)"]
L1 --> V1_3[Introduction to Haskell]
C1_2 --> C1_3[Функциональное программирование на языке Haskell II]
L2 --> B2_1[Effective Haskell]
L2 --> C2_1["Functional Programming Course (Tony Morris & Mark Hibberd)"]
L2 --> V2_1[The Haskell Unfolder]
L2 --> B2_2[Haskell in Depth]
L2 --> B2_3[Thinking with Types]
L2 --> B2_4[Production Haskell]
L2 --> B2_5[Parallel and Concurrent Programming in Haskell]
B1_1 & B1_2 & B1_3 & B1_4 & C1_1 & C1_3 & V1_1 & V1_2 & V1_3 --> L2
subgraph "Books"
B1_1
B1_2
B1_3
B1_4
B2_1
B2_2
B2_3
B2_4
B2_5
end
subgraph "Courses"
C1_1
C1_2
C1_3
C2_1
end
subgraph "Video series"
V1_1
V1_2
V1_3
V2_1
end