Generally a good quality video is too big to send by most emails. Making it in a Hi Def setting utilizes even more memory. If you cut the definition down the video gets grainy and blurry.
Your Android phone will take very good Hi Def video's and it's generally set to take them that way as default. The memory on your phone can be limited so it's always best to download it to your PC, make sure all of it's been transfered then delete it off the phone. Your Android tablet is similar but it generally has more memory for storage so you can leave the video's on it until it fills it up.
There's several ways to store your videos. I usually use 3 or 4 different storage methods. I'll list them with some of their advantages.
1) download the video to your PC and save in it's own folder on the HDD. Remember it takes alot of memory. Advantage is you can easily look at it whenever you want. Once saved on your HDD you can easily copy it to all the following options.
2) once downloaded to your PC, burn it to a DVD. Advantages are this could be your "local" backup as well as can be played on your DVD/BluRay player. You can also pass it on to whomever you want to give copies to.
3)upload it to youtube. If you don't have a youtube account it's easy to add one and it's free. Once uploaded you can mark it as private or public for sharing with others. I have many youtube vids. The advantage of youtube is you can share your vids with the world and just about everybody has seen vids on youtube.
4) upload it to google pictures. If you don't have an account you can set one up easily and it's also free. Like youtube the vids can also be marked as private or public so it can be shared. Advantages are you can store your videos and pictures on your google pictures account. They can be individually shared so those you don't want shared won't be. It's good as an "off site" backup for all your pics and videos. I've been using google pictures more lately as I share alot of vids and pics and like that I can back them up on that site.
When you use youtube or google pictures all you have to do is email or text the video's link address to whomever you want to share it with and they just click on it and then they can view the video. You can also post the link to your video in most forums where you want to add the video to your post.
Once you've done a couple it's a piece of cake.
Both vids taken by an Android phone:
example of a link to google pictures. 250's 1st run
example of a link to youtube. 235 break in