Non-sync : For local => 2, 3, 4, 5, 6, 7, 8 and 9 For Server => 10, 11, 12, ... 97, 98 and 99 Sync : 1, 100 and 100 + ==================================== 10-99 - Temp 100 - Golang 200 - DS 300 - Sql & NoSQL 400 - JavaScript 500 - DevOps & Linux, git, macOs 600 - PHP & logic 700 - English 800 - Finance 900 - Self Development