Adjectives That Change Their Shape
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Many Hindi adjectives change form to match the gender and number of the noun they describe, a feature that has no real parallel in English. Accha, good, becomes achhi for a feminine noun and achhe for a plural masculine noun. Not every adjective changes this way; some, especially those ending in a consonant rather than आ, stay fixed regardless of the noun's gender.
Learning which adjectives are variable and which are fixed takes some early attention and repeated exposure. A useful habit is pairing new adjectives with a few different nouns while practising, saying accha ladka, achhi ladki, achhe bacche, to feel the pattern rather than simply memorising a grammar rule about it.
A useful drill is describing the same object with three or four different adjectives in a row, agreeing each one correctly with its noun's gender and number. This kind of repeated, focused practice, applied to a single familiar noun, tends to fix the agreement pattern far more securely than scattered, occasional use across unrelated sentences.