Java patterns:
1. https://github.com/SergioMyJava/Head_First_Design_Patterns_O-Reilly
2. https://github.com/marhuzz/JavaPatterns/tree/master/src/ru/unlimit/javapro/patterns
3. https://github.com/synergytrainings18/patterns/tree/master/Tatevik.Arakelyan
4. https://github.com/chacovi/design-patterns-head-first-book/

Java 8 features:
1. https://habr.com/en/post/224593/
2. https://habr.com/en/company/luxoft/blog/270383/
3. https://habr.com/en/post/216431/

Graph tutorials:
part1 - https://www.youtube.com/watch?v=rwjtcJSNpBs
part2 - https://www.youtube.com/watch?v=pcicxEjCPZY

It't readme file.
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