NOPE
Can I steal my neighbour's Wi-Fi?
No. Free internet is nice; stealing it is still stealing with extra router lights.
Do not access your neighbour's Wi-Fi without permission. Depending on where you live, that can break laws, service terms, or both. Ask politely, split a bill, use a public hotspot, or buy your own connection like a boring adult with fewer legal problems.
For legal questions, get local legal advice instead of trusting vibes from a website with this name.