One question, answered from the books
How do I play around a winning lane?
Find your winner and spend everything there. After your second Dragon, open Tab, identify who is actually strong, and play exclusively around them: path toward their side, ward their river, land your crowd control for their damage, and give them the kills by default. The other half of the decision is the one nobody pings you for: weak-siding. Giving your losing lane little or no help on purpose is not abandonment, it is budgeting. A lane can lose quietly while you win the map, and later in the game your laners out-scale you anyway, so the earlier you start feeding the right one, the better your late game looks.
The decision, as a picture
What it looks like in a real game
Top has lost the same 1v1 three times and wants a visit. Bot is 4/0. Every minute you spend fixing top is a minute the 4/0 Kai'Sa spends unescorted. Let top lose quietly, farm through it, and turn bot's lead into two Dragons and a dive. At thirty minutes your 2/5 top laner is somehow full build anyway, because that is what lanes do when you stop spending your game on them.
The concept: Weak-siding and enabling
Tilt Proof defines the uncomfortable half, weak-siding is giving a lane little or no help on purpose, and The Methodical Jungler defines the profitable half: laners get resources junglers do not, so the winning play is enabling yours, not competing with them.
"Mid game starts after your second Dragon. Open Tab, identify who is strong, and play exclusively around them."
"Later in the game, they will be stronger than you."