I'm taking a sql course that uses postgres but almost exclusively uses the sql shell called psql and doesnt use something like PgAdmin4 (extra scary for a non-tech person like me).

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The course wants me to somehow create a ".sql" file called build.sql. In order to do this, I apparently need to add postgres to my PATH (another scary thing given my technological illiteracy). So I've googled that and added the postgres/bin directory to the system variables on my computer.

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Now, when I open up the command prompt (regular one) and type "psql", it asks for a password. But the username is the one for my actual computer and anything I type is wrong. Even the actual password for my laptop.

What did I do wrong here? The course doesnt mention this, and I have no idea what to do unfortunately.