Modify base colors and fonts without themes

Dear all,

How and where can I modify base colors (primary, secondary, warning, info, etc.), without using themes?

I need modify base fonts too. I added two fonts, but how can I use as base font? (like for H1, H2, H3, or paragraph)

I saw 15 Powerful Features video, and there is a feature, what I cannot find in my Windows version: add custom font link. Where can I find it?