Answered by Shaykh Yūsuf Badāt
Is it a must for me to make up missed ṣalats (ritual prayer) and fasts?
In the Name of Allāh, Most Merciful, Most Compassionate
Jazāk Allāh Khayr/ Thank you for your question.
May Allāh reward and bless you for your commitment towards the injunctions of the religion.
Missed farḍh (mandatory) prayers and fasts must be made up.
“Whoever forgets to pray should pray as soon as they remember, for there is no expiation for the prayer besides performing it.” (Ṣaḥīḥ Muslim)
“We were commanded to make up our [missed] fasts.” (Ṣaḥīḥ Muslim)
You may also find this related post of interest to you; “How to Make Up Missed Mandatory Ritual Prayers”
And Allāh Knows Best