Having a career that isn't oversaturated, but instead has a wide selection of jobs is very important. Who cares if the starting salary is high if you can't even get a job in the field. Instead, we'll cover the fields that have the most optionality and jobs.
Note: Many of the data points are pulled directly from the US chamber of commerce and BLS. Please note when we mention careers that this is where the data is being pulled from. These are also all going to be entry level jobs, so even though management and executive positions are consistently in need of people, they require years, if not decades of experience.
Healthcare continues to be a field with a strong lack of people to work. With an aging population and a lack of people to fill in the already short industry has led to massive shortages in many areas of healthcare. Combine this with the rise in at-home nursing and you have a recipe to need more people. Notably, at home care and nurses(both RN and NPs) are projected to grow a lot.
Engineering is getting generalized here simply because, well, there's a lot of fields to mention. According to the BLS, engineering is consistently the area with the highest levels of employment. Most notably, it's an area that is very consistent in employment in spite of the economy. Aerospace, automotive, electronics, and development always need engineers. They don't always need other areas, but to keep growing, they need engineers.
Tradespeople, mainly in the HVAC, Electrician, and other related are in real demand. This is because trade school has taken a backseat to college in recent years, and blue collar work was not nearly as appealing for decades to white collar work. Well, nowadays it's beginning to shift to a point where people can reasonably make a great living doing the trades.
While legal is a space that has certainly more saturated with time, it is still a field that does not lack opportunity for those in the field. There is still strong demand from corporations and lawfirms for really good lawyers. The unemployement rate is almost always low, and as law continues to get more complicated, the need for more council is there.
Construction is projected to have a boom in the coming years. This is evident in many states easing regulations to try and get residential up to the point that people can actually afford housing. With the infrastructure bill, inflation reduction, and chips act, we're seeing massive investment into infrastructure. To take advantage of this, the construction industry is rapidly expanding, providing a ton of opportunities to work in the field.
Pretty much anything in education (especially those jobs requiring advanced education) is in high demand. Education is a constantly expanding field, yet there has been a real lack of well educated smart people.