die Haltung
posture
The way someone holds their body; body posture.
Eine aufrechte Haltung kann Rückenschmerzen vorbeugen.
Good posture can help prevent back pain.

posture / attitude
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posture
The way someone holds their body; body posture.
Eine aufrechte Haltung kann Rückenschmerzen vorbeugen.
Good posture can help prevent back pain.

'Haltung' comes from the verb 'halten' (to hold). This connection helps you understand the meanings: the way you hold your body (body posture), an opinion you hold (attitude), the keeping of animals, or the composure you hold on to (keep).
Er hat eine klare Haltung zu politischen Themen.
He has a clear attitude toward political issues.
In connection with body posture, people often speak of 'gute Haltung' (good posture) or 'schlechte Haltung' (bad posture). 'Eine aufrechte Haltung' (an upright posture) is also a fixed combination.
Langes Sitzen am Schreibtisch führt oft zu einer schlechten Haltung.
Sitting at a desk for long periods often leads to bad posture.
When 'Haltung' (attitude) means an opinion, it is often used with the preposition 'zu' or 'gegenüber' (both with the dative) to name the topic.
Wie ist deine Haltung zu diesem Vorschlag?
What is your attitude toward this proposal?
In the context of animal husbandry, 'artgerechte Haltung' (species-appropriate keeping) and the compound 'die Massentierhaltung' (factory farming) are important and common terms.
Viele Verbraucher achten auf eine artgerechte Haltung der Tiere.
Many consumers pay attention to species-appropriate keeping of animals.
The ability to remain calm and controlled in a difficult situation is expressed with the fixed phrase 'die Haltung bewahren' (to maintain one's composure).
Obwohl sie sehr nervös war, bewahrte sie während des Vortrags ihre Haltung.
Although she was very nervous, she maintained her composure during the presentation.
status / stand
'der Stand' and 'die Haltung' can both have to do with the body. 'der Stand' mainly describes how someone is standing, for example whether the feet are stable or whether someone has a firm stance. 'die Haltung' means the whole body posture, that is, how someone holds their back, shoulders, or head. You can confuse the words because both are visible when someone is standing. When it is about stability and the position of the feet, 'Stand' fits. When it is about the overall shape of the body, 'Haltung' fits.

Nach vielen Stunden am Schreibtisch ist ihre Haltung oft schlecht.
After many hours at the desk, her posture is often poor.
Beim Training achtet der Trainer darauf, dass alle einen sicheren Stand haben.
During training, the trainer makes sure that everyone has a secure stance.