haben
to have
Expresses possession or belonging.
Ich habe ein neues Fahrrad.
I have a new bicycle.

to have
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to have
Expresses possession or belonging.
Ich habe ein neues Fahrrad.
I have a new bicycle.

'Haben' (to have) is the most important auxiliary verb for forming the present perfect tense. It is combined with the past participle of the main verb, which stands at the end of the sentence.
Ich habe gestern einen interessanten Artikel gelesen.
I read an interesting article yesterday.
To express necessity, English 'to have to', German uses the modal verb 'müssen' (must / to have to). The construction 'etwas zu haben' means that you possess something, not that you have to do something.
Ich muss morgen früh aufstehen.
I have to get up early tomorrow.
The structure 'haben + zu + infinitive' expresses an obligation or necessity, similar to 'müssen' (must / to have to). This form is often used in more formal or written contexts.
Alle Mitarbeiter haben die neuen Sicherheitsregeln zu beachten.
All employees must observe the new safety rules.
'Haben' (to have) is used in many fixed expressions for feelings and states. Typical examples are: Hunger haben (to be hungry), Durst haben (to be thirsty), Angst haben (to be afraid), Glück haben (to be lucky), or Recht haben (to be right).
Keine Sorge, du wirst Glück haben bei der Prüfung.
Don't worry, you will be lucky on the exam.
The expression 'mit etwas/jemandem zu tun haben' (to have to do with something/someone) describes a connection or relationship. The preposition 'mit' always requires the dative here.
Seine Entscheidung hat nichts mit dir zu tun.
His decision has nothing to do with you.
To express dislike, you use the phrase 'etwas gegen jemanden/etwas haben' (to have something against someone/something). The preposition 'gegen' always takes the accusative.
Ich habe nichts gegen deinen neuen Freund.
I have nothing against your new boyfriend.
to be
'sein' and 'haben' are both very important verbs and are also used as auxiliary verbs. As a main verb, 'sein' tends to describe a state, a quality, a place, or an identity: someone is tired, at home, or a doctor. 'haben' tends to describe possession, belonging, feelings, or characteristics: someone has a car, is hungry, or has blue eyes. As auxiliary verbs, both form the Perfekt, but not with the same verbs. Learners often confuse them because similar ideas are expressed differently in some languages. A simple guide is: for states and qualities, you often use 'sein'; for possession and many feelings, you often use 'haben'.

Haben Sie beim Termin Ihre Gesundheitskarte dabei?
Do you have your health insurance card with you for the appointment?
Am Abend sind wir nach der langen Reise sehr müde.
In the evening, after the long journey, we are very tired.