Investing in oneself by spending time or money on personal development such as education, skills, or health for future benefit.
キャリアアップのために自己投資として英語の勉強を始めた。
I started studying English as an investment in myself to advance my career.
自己投資は短期的には負担でも、長い目で見れば成果につながることが多い。
Self-investment can be a short-term burden, but in the long run it often leads to results.
健康は最大の自己投資だと言われることが多い。
People often say health is the greatest investment in oneself.