Header 1 Sophoz - 85px
Alexa Std is a pretty close match to Savoye LTE Plain 1.0 used in the logo. It is an Adobe Typekit font, which can be uploaded to Squarespace.
Header 2 - in Canva, Oswald 42
Header 3- in Canva, Monserrat 24
Paragraph - in Canva, Source Sans Pro 16; in Squarespace, Work Sans 16px
Logo font: Leelawladee Bold and Leelawladee and Savoye LTE Plain 1.0
Brand kit: in Canva - all logos present there. Savoye LTE Plain 1.0 cannot be uploaded to Canva. I did not try with Alexa Std from a free site.