I want a typography logo for an application. If I use free fonts for that, can I just use them directly without mentioning the creator of the free font, or without linking the page where I download them? Or do I have to?
Each font should have a licence that tells you exactly what you can or cannot do without it. Some require that you give them attribution, some require that you buy a licence if it's going to be used for commercial work. If you are unsure about the licence, contact the author of the font.