Yes , Composites are good materials to close Anterior teeth Gaps , I use them regularly

It can be done. Other option is laminates. but need to check clinically to decide any treatment modality.

Composites are one of the best material available in dentistry but brand ,its type varies according to situation and location so u will have to visit ur dentist. Other options are veneer,laminates and crowns.

Please understand that this is not a platform to describe this procedure "in detail". And the applicability of any treatment protocol is judged after a proper clinical evaluation of the case, for which you need to visit a Cosmetic dentist. I will give you one example to make you understand the case applicability of composites only. If there is a gap of 2 millimetres between your teeth it will be distributed equally between the two teeth during the composite build up. So the effective final width of your teeth will increase by 1 millimetre which can look abnormal if your teeth are not naturally narrow. And hence rational opinion without a look at the clinical condition of the teeth is not possible, in the best interest of your own health and aesthetics. You can post the clinical pictures of your teeth for an online consultation with the specialist. Regards