Uploaded July 2026 | Updated September 2026, 2 weeks ago
❓ Is LEO different than leo? That's a definite sometimes. I'll break down when case matters for email addresses, web addresses, filenames, and passwords, with opinions on what to use when.
❓ Upper or lower case?
Capitalization rules can be inconsistent. Email addresses and most web addresses ignore case. Filenames depend on the system, so stick with lowercase to stay safe. Passwords always care about case, so type them exactly. And in writing, proper capitalization matters more than you might think.
Updates, related links, and more discussion: askleo.com/193828
🔔 Subscribe to the Ask Leo! YouTube channel for more tech videos & answers: go.askleo.com/ytsub
✅ Watch next ▶ The Most Important Skill ▶ youtu.be/-G1vQny6bdk
Chapters
0:00 When Should I use Capital Letters?
0:53 Email addresses: no
1:34 URLs: mostly no
5:53 Passwords: always
6:11 Written English
7:20 Bonus: CamelCase
❤️ My best articles: go.askleo.com/best
❤️ My Most Important Article: go.askleo.com/number1
More Ask Leo!
☑️ askleo.com to get your questions answered
☑️ newsletter.askleo.com to subscribe to the Confident Computing newsletter.
☑️ askleo.com/patron to help support Ask Leo!
☑️ askleo.com/all-the-different-ways-to-get-ask-leo for even more!
#askleo #grammar #coding
❓ Is LEO different than leo? That's a definite sometimes. I'll break down when case matters for email addresses, web addresses, filenames, and passwords, with opinions on what to use when.
❓ Upper or lower case?
Capitalization rules can be inconsistent. Email addresses and most web addresses ignore case. Filenames depend on the system, so stick with lowercase to stay safe. Passwords always care about case, so type them exactly. And in writing, proper capitalization matters more than you might think.
Updates, related links, and more discussion: askleo.com/193828
🔔 Subscribe to the Ask Leo! YouTube channel for more tech videos & answers: go.askleo.com/ytsub
✅ Watch next ▶ The Most Important Skill ▶ youtu.be/-G1vQny6bdk
Chapters
0:00 When Should I use Capital Letters?
0:53 Email addresses: no
1:34 URLs: mostly no
5:53 Passwords: always
6:11 Written English
7:20 Bonus: CamelCase
❤️ My best articles: go.askleo.com/best
❤️ My Most Important Article: go.askleo.com/number1
More Ask Leo!
☑️ askleo.com to get your questions answered
☑️ newsletter.askleo.com to subscribe to the Confident Computing newsletter.
☑️ askleo.com/patron to help support Ask Leo!
☑️ askleo.com/all-the-different-ways-to-get-ask-leo for even more!
#askleo #grammar #coding
