spezialisiert auf
specialized in
Having special knowledge, skills, or a particular focus in a narrowly defined field or area.
Diese Anwältin ist auf Familienrecht spezialisiert.
This lawyer is specialized in family law.

specialized
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specialized in
Having special knowledge, skills, or a particular focus in a narrowly defined field or area.
Diese Anwältin ist auf Familienrecht spezialisiert.
This lawyer is specialized in family law.

The word 'spezialisiert' (specialized) is the past participle of the verb 'spezialisieren' (to specialize). It is used like an adjective to describe a person or thing.
Ein spezialisierter Handwerker kann das Problem schnell lösen.
A specialized tradesperson can solve the problem quickly.
'Spezialisiert' (specialized) is almost always used with the preposition 'auf' (in/on), followed by the accusative. This structure describes the field or area of specialization.
Die Klinik ist auf Herzerkrankungen spezialisiert.
The clinic is specialized in heart diseases.
People or institutions are often specialized. Typical subjects are therefore: a doctor, a company, a workshop, or a lawyer. The field can be a topic, a technique, or an area.
Diese Firma ist auf Software für Architekten spezialisiert.
This company is specialized in software for architects.
general
'allgemein' and 'spezialisiert' are often opposites. 'allgemein' means that something applies to many cases or does not go into great detail about one specific topic. 'spezialisiert' means that someone or something is focused on a narrow specialist field. The words can be confused when talking about knowledge, courses, doctors, or services. General advice works for many questions; specialized advice works for a specific problem.

Die Ärztin ist auf Hautkrankheiten bei Kindern spezialisiert.
The doctor specializes in skin diseases in children.
Der Kurs gibt zuerst einen allgemeinen Überblick über das Thema.
The course first gives a general overview of the topic.