Sefirat Haomer

Which is the correct version of counting the omer – "… yamim la’omer" or "… yamim ba’omer"? Is there a content difference or only a grammatical one between them?

Is one permitted to buy new jewelry or clothes online during Sefirat Ha'omer?

Can one listen to uplifting music while being in quarantine during Sefirat HaOmer?

Is a haircut permissible on Rosh Chodesh Iyar? Is this year any different, because Rosh Chodesh falls on Friday and Shabbos?

The laws of forgetting a day of Sefirat Haomer. What should one do if he misses a day, and what is the Halacha in a case of uncertainty?

Which days does one mourn? What are the prohibitions during these days? What is the reason for mourning during Sefira?

Precisely in these days - the days between Pesach and Shavuot - it is fitting to place special emphasis on improving our behavior and displaying respect for others.