There are many ways humans have become threats to sharks such as:

Shark Finning: its when sharks are targeted by humans for their fins to be used for shark fin soup in many countries as a delicacy. Which is a dumb dish since it is proved to have no nutrients for us humans to gain from.  

Bycatch: is where fisherman claims to unintentionally catch sharks in their fishing gears such as nets that was intended for other species. It causes injury to the sharks that get caught in these net and most get infected and die. Sometimes its an accident but most take advantage of it since it is legal to keep bycatch animals from nets so those fisherman finds a loophole. 

Ocean Pollution: this one is human cause that has been around for ages since the industrial revoultion as it includes the plastic debris, chemicals, and oil spills put into the ocean. It harms sharks and their prey as the contaminants accumulate in their bodies, affecting their health and reproductive success. 

Illegal fishing: this is when boats with fisherman targeted sharks do it when it isn't alowed so it is known as Illegal, unreported, and unregulated (IUU) fishing which contributes to shark declines. Since some species are protected, but enforcement is challenging as not all of them are protected enough. 

Apex Predators: Which means they are on top of the food chain. Therefore they help regulate the populations of other marine species and keeping them in check the sharks prevent overpopulation of certain species in order to maintain a healthy ecosystem.

Species Diversity: As such sharks eliminate the weak and sick marine animals in which keeps the species in check. It ensures that only the fittest of individuals survive, thus promoting species diversity. Without sharks, a few prey species could become dominant which could lead to imbalances within the ecosystem.

Food Web Balance: Since sharks feed on a variety of species they prevent any one species from becoming too abundant basically become overpopulate. This allows other marine species to thrive to become a balanced food web.

Regulating Lower Trophic Levels: Sharks also moderate the populations of marine animals below them on the food web by consuming. To prevent weaker or less well-adapted individual species from overwhelming their environment.

Ocean Health Indicator: Lastly a shark populations' presence and health serve as an indicator of overall ocean health. Since declines in shark populations can prove that there's environmental issues, such as overfishing or habitat degradation within the ocean.

There are many ways to help sharks such as:

Volunteer with Organizations: Such as Shark Stewards, which rely on volunteer energy to protect sharks and ocean habitats. Volunteers can participate in beach clean-ups, online events, and outreach programs. And virtual volunteers are needed for also education programs, grant writing, and outreach. The link is here: Contact Us – Shark Stewards 

Support Shark Conservation Efforts: Like this website called Shark Angles.org that lists 15 ways to help sharks. Some of them are: 15 Ways To Save Sharks | Shark Angels 

• Adopt a shark in which help fuel conservation campaigns.

• Learn about shark laws worldwide to advocate for stronger policies.

• Reduce single-use plastics to prevent ocean pollution.

• Schedule and present presentations to educate others about shark conservation.

• Also how to choose sustainable seafood options to reduce demand for shark products.

Donate and Raise Awareness: By visiting websites such as Sea Shepherd, Oceana, The Zoo Society and the Rob Stewart Sharkwater Foundation you can give donations to help support shark conservation. Such as: Donate | The Zoo Society , Donate — Sea Shepherd Conservation Society , Donate to Oceana | Ocean Conservation Nonprofit | OCEANA - Protecting the World's Oceans , Donate to the Rob Stewart Sharkwater Foundation 

Responsible Tourism: Swimming with sharks can be also a great way in changing your perspective by seeing how sharks are really like. It helps dispel the “Jaws” misconception by going shark diving as well. In the shark angles website there is a page in which tells you where to go swim with sharks that are responsible shark tourism operators since they help conserve sharks and are well educated.  Here is the link: Shark Diving | Shark Angels - Shark Conservation Group