provide a very good draining soil, visit the container forum for some great mixes
provide full sun, minimum 6-8 hours
water when nearly dry, overwatering will cause root rot quickly
fertilize regularly with a soluble brand at about a 3:1:2 ratio of NPK with minors if possible if not add them separately. Foliage Pro has everything citrus wants and makes fertilizing easy. Many here love it, you dont have to have it just make it easier. Some people add a bit of white vinegar when they water to lower the PH. citrus prefer a slightly acidic soil.
try and maintain a soil temperature above 55 for active growth in winter. if this is difficult to do in winter then you should back off of the watering a lot and decrease the amount of light to avoid winter leaf drop

And most important, dont be afraid to ask questions we love to help out

oh and we all love to see pics of members trees, especially if you have issue because we can diagnose them must easier.

good luck
Mike

Your trees certainly show us you that you are doing a great job.

Mike

I just share everything you have taught me. Learned from the best :)