For legato playing, make sure the right hand fingers pass through the string spending very little time touching the string (when you touch a vibrating string you mute it). For staccato, place the next available finger on the string as soon as possible purposefully stopping the sound (also called preparation). Beginners might want a little bit of preparation for security and accuracy (you'll hit the correct string if you fingers are resting on it) - also see my lesson on Right Hand Planting & Preparation (https://www.thisisclassicalguitar.com/lesson-right-hand-planting-preparation/). Students often roll chords for no other reason than it being built into their muscle memory or because they have trouble playing a clean solid chord. Make sure you've decided to roll a chord and that it benefits the musical texture and does not disrupt the rhythm.
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