Is There a Way to Press Once to Start and a Second Time to End Bulb Mode on a Canon Rebel T3?

One click to open and another click to close shutter is named Time Mode (T mode). Some cameras offer it (more so in the old days, new users do not know, do not care). Otherwise, most any remote shutter release offers a slide switch to hold it open until you change it.

1. Which DSLR camera is better? Nikon d3100 or Cannon EOS rebel t3?

As already stated, it depends a lot on taste. The best thing you can do is first decide what type of photography you want to shoot. Then check the features available on each model. Third, read some customer reviews on both models. My preference is Nikon. But that's me. Good Luck and do not be discouraged by rude remarks. Some people are just like that. Makes you wonder why they even want to answer. (Insert sheepish grin here)

2. What would be a good but cheap flash for my Rebel T3?

I recently Purchased A Rebel T1i and i use an old vivitar flash it is old but it works great so dont go looking for name brand so much especially if you want cheap. I do not recommend b&H photo because they are expensive if you narrow down what you want amazon is great for that

3. Will my luggage be transferred automatically on a layover between T3 and T2 of Dubai International?

Terminal 3 is for Qantas and Emirates only. Jet Airways flights arrive at Terminal 1."Ukrainian Airlines" - I think you mean "Ukraine International Airlines" which also uses Terminal 1. Now, since both your airlines are using Terminal 1, you do not need to worry about transferring terminals.If you are on one ticket for the entire journey, then your luggage will be transferred.If you have two separate tickets then you will need to enter Dubai (which means, you will need a visa), collect your luggage, and then check in again. It also means you cannot board your Jet Airways flight unless you are able to land and enter in Dubai

4. What are the homeopathic remedies available for subclinical hypothyroidism (TSH being in the range of 4.5-5.5 and T3 and T4 being normal)?

I am not sure - however there is a homeopath that owns a website Homeopathy for Health, unique specialty formulas She will make you a custom formula if she does not already have it

5. Creative Gigaworks T3 sub with different speakers [closed]

I am not sure if it is damaging, but plugged them into the 4ohms out and it just amps them up louder. So I guess it is fine. I am sure it damages something somewhere though

6. Whats the best lens i can buy for my canon T3?

As you have bought the T3 I will assume you are on a tight budget and wo not be buying L series lenses. You probably already have the best lens! The 18-55 is wide enough in a tight space to get groups and long enough to get individuals. Your best investment would be a good Canon Speedlight - at least the 430EX do not bother with the 270EX as it is not much better than the pop-up. The 50mm f/1.8 or 1.4 are both great lenses but trying to get a party group shot indoors in a small house is tight! If you want a prime lens then the Canon 28mm F/2.8 or the Sigma 30mm f/1.4 would be a better buy. I take lots of kid's party shots and even an f/1.4 lens wo not give a fast enough shutter speed to freeze excited kids - you need a flash that you can bounce. I use a Canon 450D (Rebel XSi) and a Canon Speedlite 420EX. In the tight confines of a small house I use my 18-55 kit lens; in larger venues I use an EF 28-105mm f/3.5-4.5. I have a 50mm f/1.8 - never use it for this - not versatile enough.

7. Where can I sell my Canon Rebel T3 (not online)?

Friend, classmate, schoolmate, dorm mate, flea market, fairs, pawnshop

8. Which lens is best for a canon t3?

A direct replacement for your 18-55mm costs more than your budget, and probably wo not make much difference - in your shoes, I would look at the 55-250mm EF-S, for more power. The only fisheye in your price bracket is the Samyang/Rokinon/Whoever put their name on this weeks' batch 8mm f3.5. It's MF. and you are limited to Av and M modes, but it's a fair performer.