I would offer the following suggestions.
Don't accept friendly shared taxi rides...don't let yourself get...TAKEN.
Now that the safety aspect has been covered, the other recommendations here are very good. With the wall chargers, make sure you don't leave stuff unattended.
I'm not saying you need to watch your phone/laptop charge while it's charging, but don't leave the room for extended periods. These kind of things can overheat easily and either blow your device or perhaps start a fire in rare cases.
Travel laundry soap is brilliant.
If it feels like a scam, it probably is. Things like 3-card monty, bars that have shady dudes outside (there's a difference between a bouncer and these guys, you can tell just by looking at them USUALLY).
Don't carry your passports around, copy them and carry the copies.
All that being said, travel with confidence and have fun and don't feel the need to be constantly looking over your shoulder. That'll ruin it for you.