fahren
to ride / go
To move by means of a vehicle such as a car, bus, train, or bicycle.
Ich fahre jeden Morgen mit dem Bus zur Arbeit.
I take the bus to work every morning.

to drive / ride
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to ride / go
To move by means of a vehicle such as a car, bus, train, or bicycle.
Ich fahre jeden Morgen mit dem Bus zur Arbeit.
I take the bus to work every morning.

As a verb of movement from one place to another, 'fahren' forms the perfect tense with the auxiliary verb 'sein'. This is a common source of mistakes for learners.
Wir sind letztes Jahr nach Italien gefahren.
We went to Italy last year.
The perfect tense is formed with 'haben' when 'fahren' describes driving a vehicle without a change of location, or when the activity itself is the focus. 'Haben' is also used when transporting someone.
Er hat seinen Sohn zur Schule gefahren.
He drove his son to school.
The word family of 'fahren' includes important nouns like 'die Fahrt' (the trip), 'der Fahrer' (the person driving), and 'das Fahrzeug' (the means of transport/vehicle).
Die Fahrt von Hamburg nach München dauert mit dem Zug etwa sechs Stunden.
The trip from Hamburg to Munich takes about six hours by train.
The vehicle is indicated with 'mit' (+ dative). The destination is often indicated with 'nach' (cities, countries without an article), 'in' (+ accusative, countries with an article, buildings), or 'zu' (+ dative, people, places).
Fährst du mit dem Auto oder mit dem Zug?
Are you going by car or by train?
The sentence 'Ich fahre Auto' means that you are sitting behind the wheel yourself. 'Ich fahre mit dem Auto' can mean that you are driving yourself or simply riding as a passenger.
Ich kann nicht telefonieren, ich fahre gerade Auto.
I can't talk on the phone; I'm driving right now.
In the meaning 'to travel', 'fahren' is often combined with typical vacation destinations, such as 'in den Urlaub fahren' (to go on vacation), 'ans Meer fahren' (to go to the seaside), or 'in die Berge fahren' (to go to the mountains).
Fahren wir dieses Wochenende an einen See?
Shall we go to a lake this weekend?
In this meaning, the subject of the sentence is the means of transportation itself, not a person. It describes the regular schedule.
Der letzte Bus fährt um 23:30 Uhr.
The last bus runs at 11:30 p.m.
The idiom 'jemandem in die Glieder fahren' means that someone gets a sudden fright. The person who is frightened is in the dative.
Der plötzliche Schrei fuhr mir durch Mark und Bein.
The sudden scream chilled me to the bone.
to go
'gehen' and 'fahren' can both mean that you move to another place. The difference usually lies in the means of transport. 'gehen' is used when you are going on foot or, more generally, leaving a place. 'fahren' is used when a vehicle is involved, for example a car, bus, train, or bicycle. Learners often confuse the words because some languages use a word like 'go' for travel in general. In German, however, you say: 'zu Fuß gehen' (to go on foot / to walk), but 'mit dem Bus' or 'mit dem Auto fahren' (to go by bus or car).

Die Klasse fährt morgen mit dem Bus ins Museum.
The class is taking the bus to the museum tomorrow.
Nach dem Essen gehen wir zu Fuß durch den Park.
After the meal, we walk through the park.