1. Mountains: Elevated areas of land with steep slopes and high peaks.
2. Hills: Similar to mountains, but lower and with gentler slopes.
3. Plains: Flat or gently rolling areas of land, often found at lower elevations.
4. Plateaus: Elevated, flat or gently rolling areas of land with steep sides.
These basic landforms are further subdivided into many different types. For example, mountains can be categorized as volcanic, folded, fault-block, or dome mountains.