Quick answer
What happens if I send to the wrong network?
Usually the funds are unrecoverable. When they aren't, and what to check first.
The long answer is still being written.
Other questions
Is USDT the same as Bitcoin?No — one tracks a dollar, the other floats. Who issues each, and why it matters.
Do I need a hardware wallet?Depends on the amount and how often you move it. A threshold you can apply.
Why is my transaction still pending?Fees, congestion and nonce order — how to tell which one you're facing.