Mac Miller, from Pittsburgh, blended hip hop with jazz, soul and lo-fi textures, and his later music leaned mellow and introspective. These beats are for that relaxed, reflective kind of record.
Most of them are hip hop, most feel mellow or uplifting, and most are also tagged lo-fi. Some are built around guitar.
Start with "Counting Stars", the most-viewed beat in this set on YouTube.