You can access them at any point by simply clicking on "Help" scrolling and clicking on "Tip of the Day", when you do this it will display a tip for you as well as a button to scroll through some of them, one never knows when its the right tip for you.
Note the button for "Next Tip" is right there making it easy to slowly work through these. Often they are simple tips to help researches work quicker and better.
With so many tips available with a few clicks you may find some that help you with your research and with getting around in Ancestral Quest. Check it out and enjoy these great features in Ancestral Quest!