Yes
The proper way to wear a yarmulke is to wear it on the Sabbath, Shabbat, or when in Shul. One should wear a yarmulke whenever everyone else is wearing one.
No. You don't have to be orthodox to wear a yarmulke. In fact, you don't have to be Jewish. Some modern liberal Jewish congregations have pronounced the yarmulke optional during services or have dropped it completely, but it is still primarily a matter of individual choice. There are even some Jews who are quite secular, do not regularly pray or attend synagogue services, but who wear the yarmulke in general daily life.
Orthodox Jewish men wear the Yarmulke all the time. Other Jews (male and female) decide for themselves whether or not to wear it.
A yamaka or yarmulke is a beanie that covers a Jewish man's head. They wear them as a sign of respect toward God during studying, eating and prayer.
Yes, but most only wear it inside the synagogue or at home during Jewish prayers. Some wear it all the time, just like the Orthodox.
Yarmulke
Yarmulke and Yashmak
A yarmulke, also known as a kippah, is a small, round skullcap worn by Jewish men as a sign of reverence and humility before God. It is often worn during religious services and at other times to show one's connection to their faith.
Orthodox Jewish men wear a yarmulke (a skullcap). It begins with the letter Y.
Jewish teachers (rabbis) typically wear a kippah or yarmulke on their head.
A kippah, or Yarmulke, or a hat or streimel.
Yarmulke (Yiddish) or kippa (Hebrew).