First, understand what a bridge even is. When you move USDC from Ethereum to, say, Base, the token doesn't physically travel. The bridge locks your coins on one side and mints a representation on the other. That lock-and-mint design is the soft spot. If someone forges the "yes, the deposit happened" message, they can mint tokens out of thin air with nothing backing them. That's the core of most big hacks. Knowing that one fact changes how you pick a bridge.
So pick carefully. My first rule: prefer the native bridge whenever one exists. If you're going from Ethereum to an L2 like Arbitrum, Optimism, or Base, those chains have an official canonical bridge that inherits security straight from Ethereum's consensus. It's slower coming back, sometimes a multi-day withdrawal window, but it's the safest route by a wide margin. I'll take slow over robbed every time.
Third-party bridges are the convenient ones, the aggregators that route you across a dozen chains in minutes. They're handy. They're also where a lot of the carnage happened. If you're going to use one, check three things before you touch it. How long has it run without an incident? Does it publish security audits? Does it have an active bug bounty? A bridge that's operated cleanly for two years and pays whitehats to break it is a very different animal from a shiny new one promising the lowest fees. Low fees are not a safety feature.
Now the habits that actually save your money, regardless of which bridge you use.
Test with a tiny amount first. Always. Send five or ten dollars across, watch it land on the other side, confirm it shows up in the right wallet on the right chain. Then send the real amount. Yes, you pay gas twice. That's the cheapest insurance you'll ever buy. I've caught a wrong destination chain this way more than once.
Check the URL like your funds depend on it, because they do. Phishing sites that clone bridge front-ends are everywhere. Bookmark the real one. Don't click bridge links from Twitter, Telegram, or a Google ad. Type it or use your bookmark, every time, no exceptions. A fake front-end will happily connect to your wallet and ask you to sign an approval that empties it.
Confirm the destination actually supports your token. This one's boring and people skip it. If you bridge a token to a chain where the receiving wallet or address can't handle it, you can lose it for good. Make sure your wallet is set up on the destination chain and that the token contract there is the legit one.
For anything large, and I'd call anything over six figures large, don't shove it through in one move. Split it. Run it across two different reputable routes so a single failure can't take all of it. Better yet, bridge into a fresh wallet rather than your main vault, so if something downstream goes wrong the blast radius is small. Never bridge an entire treasury in a single transaction. That's how a bad day becomes a catastrophe.
Watch your approvals after you're done, too. Bridges and the swap steps around them often ask for token spending permissions. Once you've moved your funds, go revoke anything you don't need anymore. Stale unlimited approvals are a slow leak that can come back to bite you weeks later.
A quick reality check on the trade-offs. Native bridges: safest, slowest, fewest chains. Third-party bridges: fast, flexible, riskier, and quality varies wildly between them. There's no free lunch here. Speed and convenience cost you in trust assumptions, and trust assumptions are exactly what gets exploited.
One last thing I tell everyone who asks. If you don't actually need to bridge, don't. A lot of people move assets around chasing a few extra points of yield or a hot new farm, and the bridging risk dwarfs the reward. Sometimes the smartest move is to just buy the asset directly on the chain you want it on, through an exchange, and skip the cross-chain hop entirely.
Bridging is one of the genuinely dangerous corners of crypto. Treat it that way. Go slow, test small, verify everything twice, and never trust a link someone DM'd you. Do that and you'll keep your coins. Get lazy and the next exploit headline could have your wallet in it.