Tips and Tricks on Form-Making

Hubspot: FormDesign
One thing I have learned about form design from this website was to arrange your field questions from simplest to hardest; start off your form with easy questions like name, email, age, etc., then ask your visitors some harder questions, such as their opinions on certain things that matter to them. If you start off your form with an intimidating or time-consuming field question, they might leave due to not having invested enough time into it, but if you have your visitors start off with easy questions, they'll be less likely to leave the page right away before they've completed the form, because they've already committed by then. Don't ask for phone numbers or other tings your visitors will like to keep private, though; the goal is to immerse them into your form, not scare them off.
Smashingmagazine: Best Practices for Mobile Form Design
One thing I have learned about form design from this website was to make sure you get the point of your form across with as few fields as possible. They say "shorter is better," so make sure your fields only talk about stuff relevant to said form - everythin else, just leave out. The recommended number of fields is 15. According to this point, 27% of form visitors leave because the form is too long or has too complicated of a checkout process.