scharf
spicy
Having an intense, burning taste, as with chili, pepper, or mustard.
Diese Soße ist mir viel zu scharf.
This sauce is much too spicy for me.

sharp / spicy
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spicy
Having an intense, burning taste, as with chili, pepper, or mustard.
Diese Soße ist mir viel zu scharf.
This sauce is much too spicy for me.

Since 'scharf' (sharp/spicy) has many meanings, the noun it describes is the most important clue. A 'scharfes Messer' (sharp knife) cuts well, a 'scharfe Soße' (spicy sauce) burns in your mouth, and a 'scharfes Bild' (sharp image) is clear to see.
Für dieses Rezept brauche ich ein scharfes Messer.
For this recipe, I need a sharp knife.
In connection with photos or optics, there is the fixed expression 'etwas scharf stellen' (to focus something). It means adjusting the focus so that the image is clear and not blurry.
Kannst du die Kamera bitte scharf stellen?
Can you please focus the camera?
In the meaning 'sexually attractive,' 'scharf' (hot/sexy) is colloquial. In formal situations or in written language, you should avoid this expression.
Er findet die neue Sängerin total scharf.
He thinks the new singer is totally hot.
In the context of food and taste, 'scharf' (spicy) is often combined with 'Gewürze' (spices), 'Chili' (chili), 'Senf' (mustard), or 'Essen' (food) in general.
Ich mag scharfe Gewürze aus Indien.
I like spicy spices from India.
When it is about the ability to cut, 'scharf' (sharp) often describes a 'Klinge' (blade), a 'Schere' (scissors), or a 'Kante' (edge).
Die Klinge ist noch sehr scharf.
The blade is still very sharp.
In a figurative, negative meaning, 'scharf' (harsh/sharp) is often used for communication. Typical phrases are 'scharfe Kritik' (harsh criticism), 'scharfe Worte' (harsh words), or 'ein scharfer Ton' (a sharp tone).
Die Opposition äußerte scharfe Kritik an der Regierung.
The opposition sharply criticized the government.
To describe a sudden, strong change in direction or speed, 'scharf' (sharply/suddenly) is combined with verbs of movement, e.g. 'scharf bremsen' (to brake sharply), 'scharf abbiegen' (to turn sharply), or in 'eine scharfe Kurve' (a sharp curve).
Das Auto vor uns hat plötzlich scharf gebremst.
The car in front of us suddenly braked sharply.
To describe high intelligence or keen powers of observation, 'scharf' (sharp) is combined with nouns like 'Verstand' (mind) or 'Beobachtungsgabe' (powers of observation).
Sie ist bekannt für ihren scharfen Verstand.
She is known for her sharp mind.
clear
'klar' and 'scharf' can both mean that you can recognize or understand something well. 'klar' is more general: an explanation, a thought, or even water can be 'klar'. 'scharf' is used especially for images, outlines, vision, or also for a quick, precise mind. A photo is 'scharf' if it is not blurry. A statement is more likely to be 'klar' if it is easy to understand. Memory tip: 'klar' helps with understanding, while 'scharf' helps with seeing or recognizing something precisely.

Auf dem neuen Foto ist das Schild am Bahnhof endlich scharf zu sehen.
In the new photo, the sign at the train station is finally clearly visible.
Nach dem Gespräch ist mir klar, warum der Zug später kommt.
After the conversation, it is clear to me why the train is coming later.