Command Line :-

1. go build main.go
2. ./main
3. go run main.go

Packages :-

1. go mod init name
2. custom package import - import "modName/packageName"
3. custom package import - import "modName/packageName"
4. "net/http"
5. "fmt"
6. "encoding/json"
7. "strconv"
8. "time"
9. "os"
10. "github.com/joho/godotenv"
11. "log"
12. "github.com/jmoiron/sqlx"
13.	_ "github.com/lib/pq"

These topic have become learnt :-

1. User input
2. variable
3. variable shadowing
4. if else
5. switch
6. Standard/Simple named function with paramiter and argument
7. init function
8. anonymous function
9. function expression
10. higher order function
11. return function
12. named return function
13. struct
14. array
15. pointer
16. slice
17. vogus data type
18. defer
19. go rutine
20. reciver function
21. interface
22. Constructor