• 自分じぶん — oneself
• 自動車じどうしゃ — automobile
• 自由じゆう — freedom / liberty
• 自信じしん — self-confidence
• 自営じえい — self-employment / running one’s own business
• 自在じざい — freely / at will
• 自重じちょう — self-restraint / exercising caution
• 自みずから — oneself / personally
• 自画自賛じがじさん — self-praise / praising one's own work

The character 自 originally depicted a nose — an ancient way of referring to oneself. It's now widely used in modern terms for personal identity, freedom, and voluntary action.

自分じぶんを信しんじて。
Believe in yourself.

自みずから行動こうどうすることが大切たいせつです。
It’s important to take action on your own.