weitergehend
further
More comprehensive or detailed than something previous; going beyond the basic or obvious.
Für weitergehende Informationen lesen Sie bitte das Handbuch.
For further information, please read the manual.

further / more extensive
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further
More comprehensive or detailed than something previous; going beyond the basic or obvious.
Für weitergehende Informationen lesen Sie bitte das Handbuch.
For further information, please read the manual.

'Weitergehend' (further / more extensive) is the present participle of the separable verb 'weitergehen' (to continue / to go further). It literally means 'something that goes further' and therefore describes something that goes beyond a certain point.
Die Diskussion führte zu weitergehenden Fragen, die wir heute nicht mehr klären konnten.
The discussion led to further questions that we could no longer clarify today.
This word is almost always used as an adjective before a noun (attributive use). Using it as a stand-alone adjective after the noun is rare and often sounds unnatural.
Der Bericht enthält viele weitergehende Analysen.
The report contains many further analyses.
'Weitergehend' (further / more extensive) is often combined with nouns that describe information, communication, or processes. Typical examples are: 'weitergehende Informationen' (further information), 'weitergehende Fragen' (further questions), or 'weitergehende Maßnahmen' (further measures).
Die Regierung plant weitergehende Maßnahmen zum Klimaschutz.
The government is planning further measures for climate protection.
The word 'weitergehend' (further / more extensive) belongs more to formal written language. It is often found in reports, official documents, emails, or academic texts.
Für weitergehende Details verweisen wir auf das nächste Kapitel.
For further details, we refer you to the next chapter.
additional
'zusätzlich' and 'weitergehend' can both show that something goes beyond a basic thing. 'zusätzlich' mainly means: something extra is added. This can be another task, another appointment, or an extra. 'weitergehend' more often means that something is more comprehensive, deeper, or more precise than what came before. Learners may confuse the words because both express a kind of 'more'. The difference is: 'zusätzlich' emphasizes something being added, while 'weitergehend' emphasizes greater depth or greater scope.

Nach der ersten Untersuchung hat die Ärztin weitergehende Tests empfohlen.
After the first examination, the doctor recommended further tests.
Beim Einkaufen nehmen wir zusätzlich Brot für das Abendessen mit.
When shopping, we also pick up bread for dinner.