Q.Browning leaves
I have grown this avocado plant from seed. Its leaves have recently started browning around the edges. Can anyone tell me why this is?

Check the soil content. It is best to grow an Avocado in a clay pot with a potting mixture of soil and sand. Drainage is key to plant health.
Your plant may be showing signs of root rot.
Here is a link to refresh you on the care requirements.
https://www.gardeningknowhow.com/edible/fruits/avocado/indoor-avocado-plant-care.htm