
technisch
technical
Relates to technology, the way devices, machines, or processes work.
Das Gerät hat einen technischen Defekt.
The device has a technical defect.
technical
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technical
Relates to technology, the way devices, machines, or processes work.
Das Gerät hat einen technischen Defekt.
The device has a technical defect.

technical
Relates to execution or practical skill in an area such as art, music, or sports.
Der Fußballer ist technisch sehr versiert.
The soccer player is very technically skilled.

technically
Considered in a purely formal, procedural, or theoretical sense; strictly speaking.
Technisch gesehen ist die Frist bereits abgelaufen, aber wir machen eine Ausnahme.
Technically speaking, the deadline has already passed, but we'll make an exception.
The adjective 'technisch' (technical) is derived from the noun 'die Technik' (technology/technique). The ending '-isch' is a typical way to form an adjective from a noun.
Die technische Entwicklung der letzten Jahre ist beeindruckend.
The technical development of recent years is impressive.
You can recognize the meaning of 'technisch' (technical) from the context. If it is about devices or machines, it refers to how something works. In the context of sports or art, it refers to skill. If a sentence begins with 'technisch gesehen' (technically speaking), the formal, theoretical meaning is intended.
Die Anlage hat ein technisches Problem.
The system has a technical problem.
When it is about devices and machines, 'technisch' (technical) is often used in fixed combinations, e.g. 'technische Daten' (technical specifications), 'technische Unterstützung' (technical support), or 'ein technischer Fehler' (a technical error).
Für technische Unterstützung rufen Sie bitte unsere Hotline an.
For technical support, please call our hotline.
To describe skills in sports or art, 'technisch' (technical/technically) is often combined with adverbs or adjectives such as 'versiert' (skilled), 'brillant' (brilliant), or 'sauber' (clean/precise).
Die Eiskunstläuferin zeigte eine technisch perfekte Kür.
The figure skater performed a technically perfect free skate.
The phrase 'technisch gesehen' (technically speaking) is often used at the beginning of a sentence to introduce a formal or theoretical perspective. It means roughly the same as 'streng genommen' (strictly speaking).
Technisch gesehen ist das Meeting noch nicht vorbei, aber alle sind schon gegangen.
Technically speaking, the meeting isn't over yet, but everyone has already left.
subject-specific / professional
Both words can describe professional competence. “Technisch” tends to emphasize practical execution and confident handling of methods or procedures, while “fachlich” highlights knowledge and competence within a particular field. Choose “technisch” for the how and “fachlich” for subject-specific knowledge.

Für die Reparatur muss er technisch geschickt mit den Werkzeugen umgehen können.
To carry out the repair, he needs to be technically skilled at handling the tools.
Für die Reparatur braucht sie fachlich gute Kenntnisse über die Maschine.
To carry out the repair, she needs a good subject-specific knowledge of the machine.