It won't come as a surprise that all three of these are pronounced fang, but note the tones carefully!
芳 Fāng is 'aromatic':
This character is common in names. The element on top is the grass radical.
访 Fǎng is 'visit':
Common word: 访问 fǎngwèn 'visit'
妨 Fáng is 'impede':
The element on the left is 女 nǚ 'woman'.