Thanks for all, @coin-keeper, @pooya87, @kolloh! It has been a great help and great to be part of such helpful commmunity.

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Sorry once again but you mention 13 words but I have only 12.
Will this cause any problems while resurrecting my wallet from scratch?

Thanks a ton friends, as I have said, a complete newbie here

Thanks friends, pooya87 & ranochigo, I really appreciate your patience and precious time.
But what guarantees that if any NEW electrum user throws some any random words and does not reach a wallet by chance?

Edit: Reading ThomasV's post, "Why you cannot enter an arbitrary seed in Electrum" now

Hi friends, firstly, thanks for all your patience and precious time to support.
I am a newbie in Electrum Wallet and really enjoying it.
Have a few questions..:

1 - I am using Electrum Wallet Version - 2.8.2

2 - I have a 12 word SEED and a strong PASSWORD (a strongPassword fanatic here). Those two are enough to keep my BitCoins if something happens to my PC?

3 - Do I also HAVE TO back-up (copy the file) at "Users > Name > AppData > Roaming > Electrum > wallets > wallet" ?

4 - Let's assume that my computer has crashed , I lost every single file on my PC... Started from scratch. Downloaded Electrum again. I have the 12 word seed. The 12 word seed will be enough for me to get back on track or I will still need the password?

Thanks friends, I really appreciate any help.
Please also excuse any English Grammar mistakes.
Wish you the very best,
Bedros