There are many animal and insect species that sting or bite. In most cases, first aid for stings and bites include bandaging and staying with the patient until help arrives.
Reassuring the person and keeping them immobile helps in preventing the poison from spreading to other body parts. Do not cut the wound or tourniquet the affected area. Seek emergency medical help immediately and inform them of the situation. In the case where the patient collapses or stops breathing, apply CPR until medical personnel arrives. Use skills acquired from first aid certification online to give basic assistance. If it is safe and possible you can capture the animal or the insect and store it for identification. However, it is not necessary and you should not spend time to look for the animal or insect.