You have questions on 3 totally different topics. You should post 3 separate questions, to get more expert eyes on each topic.
As for the 1099-G, the simple answer is: you do not need to file a tax return. Your total income ($10,000 SSA-1099 + $1000 1099-G) is less than the $12,950 filing requirement ("it's too little of an income to report based on the fact that I don't even get close to the standard reporting of having to report at lest12,000 dollars").
You said "Now I know I don't have to declare my social security disability because I don't exceed 25 k". That's effectively correct, but not technically accurate.
Social security becomes taxable when added to sufficient other income. If you are otherwise required to file a tax return, you do need to enter it in TurboTax (TT). TT will determine the taxable portion.
Social security (including SSDI) becomes taxable when your income, including 1/2 your social security, reaches:
Married Filing Jointly(MFJ): $32,000
Single or head of household: $25,000
Married Filing Separately and lived with your spouse at any time during the tax year: $0
After TurboTax (TT) calculates the taxable portion of SS, it puts the total amount of SS on line 6a of form 1040 and the taxable amount on line 6b (2020-2). TT also produces a worksheet to show how the taxable amount is calculated. Although most people pay tax on 85% of their SS. it can be less for lower income taxpayers.
