Below is a list of 5 popular and trusted online betting sites, with direct login or registration links for each:

✅ 1. 1xBet

🌍 Website: https://1xbet.com

🔑 Registration: Easy via mobile, email or social

🎁 Bonus: 100% Welcome Bonus

✔️ Features: Live Betting, Sports & Casino

✅ 2. Melbet

🌍 Website: https://melbet.com

🔑 Login/Sign Up: One-Click Registration

🎁 Bonus: 100% Bonus on First Deposit

✔️ Features: Bkash/Cash Transactions in Bangladesh, Customer Support

✅ 3. Betway

🌍 Website: https://betway.com

🔑 Login: Email & Password

🎁 Bonus: Reliable Promotions

✔️ Features: European Security, Fast Payouts

✅ 4. Parimatch

🌍 Website: https://parimatch.com

🔑 Registration: Mobile OTP or Email

🎁 Bonus: Free Bet + Cashback

✔️ Features: Sports + Live Casino

✅ 5. Bet365

🌍 Website: https://bet365.com

🔑 Login: Secure Login System

🎁 Bonus: Depends on the specific country

✔️ Features: The most popular betting brand in the world

⚠️ Note: There may be problems accessing some sites directly from Bangladesh. Then you can access them using a VPN. Always bet legally and responsibly.