der Einschlag
impact
The impact of an object, especially a projectile, meteorite, or lightning strike, on a surface.
Der Blitzeinschlag hat den alten Baum gespalten.
The lightning strike split the old tree.

impact / influence / weft
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impact
The impact of an object, especially a projectile, meteorite, or lightning strike, on a surface.
Der Blitzeinschlag hat den alten Baum gespalten.
The lightning strike split the old tree.

'Der Einschlag' (impact) is the noun related to the verb 'einschlagen' (to strike/hit). When lightning strikes, there is a 'Blitzeinschlag' (lightning strike). This connection helps you understand the main meaning 'Aufprall' (impact).
Man hörte, wie der Meteorit in der Ferne einschlug.
You could hear the meteorite strike in the distance.
You can recognize the meaning from the context: with 'Blitz' (lightning), 'Meteorit' (meteorite), or 'Bombe' (bomb), it refers to the impact. With language, art, or personality, it is about an influence. In the context of 'Stoff' (fabric) or 'Faden' (thread), the technical meaning is intended.
Der Einschlag der Rakete verursachte einen großen Krater.
The impact of the rocket caused a large crater.
In the meaning 'Aufprall' (impact), 'Einschlag' is often used in compound nouns that describe the cause, for example 'Blitzeinschlag' (lightning strike), 'Meteoriteneinschlag' (meteorite impact), or 'Bombeneinschlag' (bomb impact).
Das Haus wurde durch einen Blitzeinschlag schwer beschädigt.
The house was badly damaged by a lightning strike.
In the meaning 'Einfluss' (influence), an adjective is often used to describe the type of influence. Typical phrases are 'einen leichten/starken/deutlichen Einschlag haben' (to have a slight/strong/clear influence).
Der Wein hat einen fruchtigen Einschlag.
The wine has a fruity note.
influence
'der Einfluss' and 'der Einschlag' can both describe that something is noticeable within something else. 'Einfluss' is the normal, general word when a person, situation, or thing has an effect on something. 'Einschlag' fits better when you mean a special touch or recognizable character, for example in music, language, or style. Learners may confuse the words because 'Einschlag' in this meaning works similarly to 'Einfluss'. But 'Einschlag' is narrower and more figurative; it often sounds as if something has taken on a certain foreign or special character.

Das Restaurant hat einen italienischen Einschlag, obwohl es deutsche Küche anbietet.
The restaurant has an Italian influence, even though it serves German cuisine.
Die Meinung ihrer Freunde hat großen Einfluss auf ihre Entscheidung.
Her friends' opinion has a major influence on her decision.