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create code fences with backticks ` or tildes ~
```
like so
``` -
add language identifier to highlight code
```python
def function(foo):
print(foo)
``` - put returns between paragraphs
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sudo chown -R postgres:postgres /mnt/data/postgresqlbefore "initdb", the directory needs to belong to userpostgres./mnt/data/postgresql/12/main, just changedata_directoryin/etc/postgresql/12/main/postgresql.confand start the service. The default password is not set, usesudoto switch to the user. Please read postgresql.org/docs/12/app-initdb.html.