Astrology has four elements, and each Zodiac sign is assigned to one element. One of those elements is water, and there are 3 water signs: Cancer, Scorpio, and Pisces.
The water signs are the signs of emotion, and deeply in tune with not only emotional energies, but also the subtle energies all around us.
Cancer is the fourth sign and nurtures; Scorpio is the eighth sign and deepens; and Pisces is the twelfth and final sign of the Zodiac and finishes.
Water Signs and Work
With work, water signs can struggle at times to get focused. They often need some help with keeping their focus on what they're doing, otherwise their emotions can make it difficult for them to get anything done. They generally don't like taking the initiative either, and would prefer someone else take the lead, so they can be good employees if they feel supported.
Water signs can work hard when they are supported and emotionally invested in what they're doing. Without that, they won't care much for what they're doing. But if they feel an emotional connection, they can be absolutely ferocious, completely throwing themselves into the work (passionate Scorpio is the most intense).
When it comes to their career, water signs need careers that they care about. If they can't connect emotionally, it's not a career for them. Cancer really needs lots of emotional support, but can thrive and achieve a great deal when they get it; Scorpio needs to be able to use it's passion and intensity, and when it can, it can be formidable with what it achieves; and Pisces needs not just emotional but also a spiritual connection, and may do best when it's spiritually nourished or when it's nourishing others.
Sometimes water signs can be quite ambitious, and Scorpio in particular can be quite ruthless, but many also don't care at all. Again, without an emotional connection, they just won't care enough to push hard, especially if their emotional needs are being met elsewhere (like in relationships, hobbies, or volunteer work).
When it comes to money, water signs can find it difficult to manage if they don't keep a close eye on it. It's easy for them to lose money, especially Pisces, and others can take advantage of how much they want to be helpful. Healthy boundaries with money becomes important, and remembering that they need to take care of themselves too.
They do tend to be the signs who can make great investors, and Scorpio itself actually rules investments. With Scorpio, it might be investing in businesses or stocks; with Cancer, it might be investing in real estate or something involving homes and families; and with Pisces, it might be angel investing or letting intuition guide where to best invest.
All of this can apply to your Sun sign, however you may find that you most connect with the water signs if your professional houses fall in these signs (2nd house of money, 6th house of work, and 10th house of career).
Suggested Reading: Water Signs in Astrology & Love