Anyone knows any articles / videos for laymen to understand these technical terms? Please help.

I would recommend videos by Tone Vays, articles by Jimmy Song, and videos by the World Crypto Network and MadBitcoins channel:

Bitcoin Fork/Chainsplit #1 - UASF/BIP148 vs SegWit2x (BIP91)
https://www.youtube.com/watch?v=wBBWubXIOzw

Bitcoin Fork/ChainSplit #2 - BIP91 Signaling to Avoid UASF/BIP148
https://www.youtube.com/watch?v=1d6QloOVp24

Tone's MA #74 - SegWit Activation Bringing Back Bitcoin Confidence
https://www.youtube.com/watch?v=z2YC62GGun8

Bitcoin Fork/ChainSplit #3 - BIP91 on Verge of Lock In, is #UASF Avoided?
https://www.youtube.com/watch?v=W4Kcvi6eWT0

Let's Talk Segwit2X with Jimmy Song and Eric Lombrozo
https://www.youtube.com/watch?v=JTCB5bRGQj0

The Bitcoin Group #151 - BIP91 Locked In - AlphaBay Motors - Ethereum Heists - Philosophy
https://www.youtube.com/watch?v=wIsU3ZLusVU

https://medium.com/@jimmysong