Where do I add custom code in theme "Baseline"

[marcelp]

URL: https://www.cotiereofficial.com/

PW: test1234

Theme: Baseline

[KetanKumar]

@marcelp

sorry but can you please share more details which code did you add your theme?

[marcelp]

I have i.e. added a custom font in the “theme.liquid”. It does work perfectly but is this the correct / best place to add it?

Here is the code and a screenshot.