A: .otf (OpenType Font) is safer and more advanced than .ttf . It is legal as long as you obtained it from a legitimate source.
Similar to DaFont, FontSpace has a strict policy against stolen fonts. Look for uploads that explicitly credit "OurType" or a derivative fan-made version.
The official OurType website occasionally offers limited character set versions or time-limited trials. These allow you to test the font in your design software before purchasing.
Perfect circles and sharp angles give it a mathematical, modern feel.
If your budget is $0, check out these excellent free-for-commercial-use sans-serif fonts from reputable sources like Google Fonts A sophisticated, highly legible sans-serif. General Sans: Perfect for a clean, modern look. A friendly but professional geometric sans-serif.