I think almost everything that was discussed on the first few pages of this thread has probably changed by now. If you have the time, start 25-30 pages from the end and read forward.
1. I don't think NOSO is the term they use any more. No Obligation Special Offers if I remember correctly.
2. Usually by completing spaces on the SWAGO board. Swago is like Bingo. YOu are not automatically enrolled to play. When they start a new board you'll be able to join, and then activities you do will earn you spaces. Like regular Bingo, if you get a line or pattern you 'win'. Sometimes it's barely worth the effort--like 5 SB. This last Swago was more valuable. As you fill in each square, it will often award SB and a Spin.
3. No you cannot earn SB and Ebates at the same time. But you may find coupon codes or get credit card rewards for the purchase and still use Swagbucks.
4. Ncraves are videos, many of which will advance automatically (little blue arrow in a circle). When these work, they earn you SB without much effort at all. The screen that says TV is only 1 SB, but it may advance all day (night) long. I earned over 100 SB on this nCrave on Tuesday. Also popular are All You Can Eat (AYCE). They are worth more, but sometimes get hung up. Actually, all the videos can get hung up, you just get lucky sometimes. And NCraves tend to go away and then return. Some people have luck opening a separate 'Incognito' window to get NCraves to work again. Clearing cookies may also help.
Hope this helps. Like you, I had Swagbucks and thought it was a waste until I learned the tricks. Good luck!