How can I find the problem with Go failed import? [closed] - postgresql

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While working on a Go web-app project (for learning),
I have encountered the following issue:
At the beginning, everything was alright.
I imported packages from the standard library,
used them in the code and everything worked.
up to the moment when I have tried to import the pq driver for PostgreSQL.
The actions that I did in detail:
The folder with the project files inside: notes.
project is in the directory: C:\Users\david\go\src\github.com\davidkuch\notes
When starting, i run the command: go mod init.
I imported the standard package "database/sql".
to download the package I used: go get "github.com/lib/pq"
after that- go mod tidy
but the compiler says:could not import {package-name} no required module provides package
{package-name}
I tried to read through the docs of the related topics, but couldn't find where I did a mistake.
the same happens for another package i have tried to install from GitHub.
where should I be looking to find the problem?
as the compiler says that he "cannot find", I made a lot of effort checking naming and paths.
but I see the package exactly in the path I try to import from.
to be more precise:
After some hours of trying to fix that by myself, I ask You for some help or explanation of what is happening.

Answer 1

project is in the directory: C:\Users\david\go\src\github.com\davidkuch\notes
You don't need to do that. Just make a folder like: C:\Users\david\notes.
Then make C:\Users\david\notes\main.go:
package main
import (
"database/sql"
_ "github.com/lib/pq"
)
func main() {
println(sql.ErrNoRows)
}
Then build:
go mod init something
go mod tidy
go build