befolgen
to follow
To comply with an instruction, order, rule, or piece of advice and act accordingly.
Wer die Verkehrsregeln nicht befolgt, riskiert eine Strafe.
Anyone who does not follow the traffic rules risks a fine.

to follow
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to follow
To comply with an instruction, order, rule, or piece of advice and act accordingly.
Wer die Verkehrsregeln nicht befolgt, riskiert eine Strafe.
Anyone who does not follow the traffic rules risks a fine.

The base verb 'folgen' (to follow) takes the dative (e.g., 'Ich folge dem Rat' — I follow the advice). The prefix 'be-' changes this: 'befolgen' always needs an accusative object (e.g., 'Ich befolge den Rat' — I follow the advice). This is an important rule for verbs with 'be-'.
Bitte befolgen Sie die Anweisungen genau.
Please follow the instructions exactly.
'Befolgen' is typically combined with things that have authority or represent an obligation. Common combinations are: 'eine Regel befolgen' (to follow a rule), 'ein Gesetz befolgen' (to obey a law), 'einen Befehl befolgen' (to obey an order), or 'einen Ratschlag befolgen' (to follow advice).
Es ist klug, den Rat eines Experten zu befolgen.
It is wise to follow an expert's advice.
The verb 'befolgen' is more formal than 'sich an etwas halten' (to stick to something / follow something). It emphasizes obligation and is often used in official, legal, or instructional contexts.
Alle Mitarbeiter müssen die neuen Unternehmensrichtlinien befolgen.
All employees must follow the new company guidelines.
to hold
'sich halten an' and 'befolgen' both mean that you act according to a rule, instruction, or piece of advice. 'sich an etwas halten' sounds very natural in everyday speech and works well with rules, appointments, or agreements. 'befolgen' sounds somewhat more formal and emphasizes more strongly that you follow an instruction or order exactly. In conversation, people often say 'Ich halte mich an die Regeln' (I stick to the rules); in official or more serious situations, 'die Vorschriften befolgen' (to follow the regulations) works well.

Vor der Reise hat Anna alle Hinweise der Ärztin befolgt.
Before the trip, Anna followed all of the doctor's advice.
Beim Termin im Amt halte ich mich genau an die Anweisungen.
At the appointment at the government office, I follow the instructions exactly.