28+ Avocado Plant Brown Spots On Leaves

Does anyone know what these are?

28+ Avocado Plant Brown Spots On Leaves. Some of the leaves started getting brown spots, very tiny at first but they kept getting bigger. About 4 days ago it proved otherwise;

Young Avocado Plant Has Brown Spots Spreading On Leaves Gardening Landscaping Stack Exchange
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Browning leaf tips are often a sign of salt burn, caused by a salt build up in the soil. Some of the leaves started getting brown spots, very tiny at first but they kept getting bigger. The avocado (persea americana), a tree likely originating from south central mexico, is classified as a member of the flowering plant family lauraceae.

I'm more worried about the small they are just small brown spots but they have spread throughout the entire leaf, and there are two more which are nearly completely brown, and.

Ever wondered why houseplants get brown tips? Can not tell if it's just a deficiency or something worse like rust rot. If your plant is outside: Prevention of avocado root rot consists of cultural controls, such as providing good soil drainage, planting resistant avocado.