Q.I Have Grown Lemon Tree From Seed, It’s Now 1 Year Old But The Leaves Are Turning Brown. Am I Over Watering?
Sorry, I cannot upload a photo, but I hope you can answer my question. Many thanks Patricia Richardson

Certified GKH Gardening Expert
Unfortunately, without a photo I am unable to tell. It is probably overwatering, though. This will be the leading cause of death in household plants.
Make sure to let the soil dry down, very thoroughly, to about 3 or 4 inches or so between watering. Citrus will appreciate a little time between watering to breathe a bit.
Here is an article to help you care for citrus:
https://www.gardeningknowhow.com/edible/fruits/lemons/how-to-grow-a-lemon-tree.htm