Be sure to close and secure all of the gaps in your defenses.
Depending on where you go, you may encounter annoying insects like mosquitoes while you are traveling. If this happens to you, be prepared to deal with them. Due to the fact that these minuscule animals constitute an essential component of the ecosystem in that nation, there is sadly nothing that can be done about the situation. In these kinds of scenarios, mosquito repellents are going to be your best friend.
A lady who had recently visited Belgrade and stayed in a hostel shared her impressions of the city with us. The only issue was that her roommate left the screen door open during the night, which rendered the area uninviting. The following morning, she awoke to find that she was covered in mosquito bites.