Mahadev can get angry due to these mistakes on the day of Pradosh Vrat, know what to do and what not to do?:

Pradosh Vrat (Pradosh Vrat 2025) has special significance in Sanatan Dharma. On this day, there is a ritual of special worship of Lord Shiva and Mother Parvati. Pradosh Vrat is observed on Trayodashi Tithi of Krishna and Shukla Paksha of every month. This festival is dedicated to Lord Shiva. According to religious belief, worshiping Mahadev and Mother Parvati on the day of Pradosh Vrat brings all the happiness in life. Also, all wishes are fulfilled. It is believed that by committing some mistakes on the day of Pradosh Vrat , the devotee may have to face the wrath of Mahadev. Also, auspicious results are not achieved. So let us know what to do and what not to do on the day of Pradosh Vrat?

On this day, after taking bath in the morning, worship Lord Shiva.
Offer flowers, cannabis, belpatra, etc. on the Shivling.
Recite Aarti and Shiv Chalisa with a true heart.
Chant the mantras of Lord Shiva.
Break the fast by eating satvik food.
After this, donate special things to the temple or to poor people.
Do Bhajan and Kirtan in the night.

What not to do on Pradosh Vrat day

Do not insult anyone on the day of Pradosh fast.
One should not consume non-vegetarian food even by mistake on the day of Pradosh Vrat.
Do not think ill of anyone during the fast.
Do not wear black clothes.
Do not offer Tulsi leaves on Shivling by mistake.
Don't argue with anyone.