Install programs for work with database: https://robomongo.org/ https://www.mongodb.com/download-center/community
Instruction to MongoDB installation: https://metanit.com/nosql/mongodb/1.2.php
Install package for encryption password data: https://github.com/shaneGirish/bcrypt-nodejs
Install packages for work with sessions: https://github.com/expressjs/session https://github.com/jdesboeufs/connect-mongo
Install packages for posts'text transformation:
https://github.com/vladzadvorny/transliter
Model Tree Structures with Child References: https://docs.mongodb.com/manual/tutorial/model-tree-structures-with-child-references/