Buying domain names is easy. Buying the right ones is hard. Here are mistakes I have personally made, ranked by how much they cost me in money or embarrassment.

1. Buying the Domain Before Validating the Idea

This is the classic. You get excited about a business idea, rush to GoDaddy, and buy the domain before you have talked to a single potential customer. I have a graveyard of unused domains that each felt like destiny at the time of purchase. The domain costs $12 but the opportunity cost of the mental energy wasted on a bad idea is much higher.

Now I force myself to wait 48 hours before buying any domain. If the idea still excites me after sleeping on it twice, then I will check availability.

2. Registering Too Many TLD Variants

Got the .com? Great. Now you do not need the .net, .org, .io, .co, and .app versions too. I used to "defensively register" every extension and it added up to hundreds of dollars a year in renewals for domains that just redirected. Unless you are building a brand that is genuinely worth protecting (which you will know when you get there), one TLD is enough.

3. Picking a Name That is Hard to Spell Over the Phone

I once had a domain with a double letter that tripped everyone up. Every single time I told someone the URL verbally, I had to spell it out letter by letter. This gets old fast. If you are building something where word-of-mouth matters (and it always matters), your domain needs to survive being spoken aloud.

4. Ignoring Renewal Prices

Some registrars offer the first year at $0.99 and then the renewal jumps to $40. I learned this one the hard way with a .ai domain that cost $25 to register and $90 to renew. Always check the renewal price before purchasing. The registrar is counting on you forgetting to transfer it before renewal time.

5. Chasing Keyword-Stuffed Exact Match Domains

In the early days of SEO, owning "bestwidgetreviews.com" would actually help you rank for "best widget reviews." Those days are long gone. Google figured out that trick over a decade ago. A branded, memorable name will outperform a keyword-stuffed domain every time in modern SEO.

"Nike" means nothing in English. "BestRunningShoes.com" tells you exactly what it is. Which one would you rather build a company on?

6. Not Checking Trademark Conflicts

This one can actually get expensive. I nearly registered a domain that was phonetically identical to an existing trademark. A quick search on the USPTO trademark database (tmsearch.uspto.gov) would have saved me the trouble. If you are planning to build a real business on a domain, spend five minutes on a trademark search first.

7. Letting Good Domains Expire Accidentally

I have lost two domains that I actually wanted to keep because I did not have auto-renewal turned on and missed the reminder emails. One of them was picked up by a domain squatter within hours of expiring and they wanted $2,500 to sell it back. Turn on auto-renewal for any domain you care about. Set a calendar reminder for the ones you are not sure about, so you can make a deliberate decision to renew or let go.

The Silver Lining

Every bad domain purchase taught me something about what makes a good name. The pattern I have settled on: short, pronounceable, no special characters, passes the phone test, and has available social handles. Run a quick scan to find names that hit these criteria automatically -- it is faster than learning these lessons the expensive way.