UTIs are common because women have short urethras — about 4cm. Bacteria have an easy path in. It's not about hygiene, it's anatomy.
Three common medications:
Fosfomycin trometamol — one dose (3g powder). Concentrates in urine, single packet, done. Not the broadest coverage.
Nitrofurantoin — twice daily for 5-7 days. Lower resistance rates. Not for people with kidney problems.
Cephalosporins — broader spectrum but higher resistance. Used when others aren't suitable.
Drink plenty of water, empty your bladder completely, urinate after sex, wipe front to back. If symptoms don't improve in 48 hours, see a doctor.