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Bitcoin Core is mainly in two languages, C++ and Python. You’re most likely going to have to learn at least some of both if you hope to contribute.
In order to use Segwit optimizations, you’ll need to use funds stored on a Segwit address which uses a different format — currently encoded as a multisigature (P2SH) address (starting with a 3 on Bitcoin mainnet)
By July 27: Exactly 336 blocks after lock-in, Segwit2x activates, and starts orphaning non-bit-1-signaling blocks. This orphaning is key because it makes BIP 148 a no-op, since all BIP 148 nodes do is the same orph…
