In Digambar Jain tradition, if an 18‑year‑old boy takes Muni‑diksha, his life changes completely. In simple points:

1. No more worldly life

- He leaves family, friends, job/study plans, property, money – everything. - From that moment he is not a “son / brother / student” in the usual worldly way, but a Muni (monk).

1. New identity

- He gets a new spiritual name from his Acharya. - He will stay under the guidance of his guru and sangh (group of monks).

1. Five great vows for life (Mahavrat)

He accepts these in the strictest way: - Ahimsa – not to harm any living being, even tiny insects. - Satya – speak only truth, and only when needed. - Asteya – not to take anything not given. - Brahmacharya – perfect celibacy in mind, speech, and body. - Aparigraha – no possessions, no attachment.

1. Lifestyle (Digambar Muni)

- No possessions except very few allowed things (like picchī, kamandal, shastra etc., depending on guru‑paramparā). - Barefoot walking, often long distances. - Food only on gochari – he goes to lay‑people’s houses and accepts very limited food once a day (or less), without desire or choice. - No cooking, no money, no phone, no comforts. - Sleeps on the floor or a very simple place, no bed. - Follows many detailed rules to avoid violence and attachment.

1. Daily life

- Early waking, swadhyaya (scripture study), dhyān (meditation), pratikraman, kāyotsarga (standing/sitting in total stillness). - Many fasts and tapas (austerities) according to capacity and guru’s guidance. - Listening to and giving pravachan (discourses) to help others follow dharma.

1. Emotional side

- He must accept that he cannot live like earlier – no entertainment, no romantic life, no social media, no career planning. - He trains the mind to stay in vairāgya (detachment) and samata (equanimity) in praise or insult, comfort or hardship.

1. Spiritual goal

- Main aim is to destroy karmas and progress toward moksha. - Muni‑dharma is considered the highest path for purifying the soul in Jain dharma.

1. Difference from ordinary 18‑year‑old life

- Other boys start college, career, marriage plans. - A Digambar Muni of 18 starts a totally opposite journey: away from enjoyment, toward self‑realization and non‑attachment.

If you want a simple explanation of what happens after diksha in general, you can read more here