Next and following 6th row/foll alt rows

I’m fairly new to knitting and need some help please understanding this pattern.

Cont in st st dec one st at each end of next and following 6th row.

Also
Cont in st st dec one st at each end of next and foll three alt rows.

I’m ok with the stvst and dec but it’s the following rows bit.

Welcome to the forum!
Decrease at each end (that’s 2sts decreased per decrease row). If you call the next row, row 1 then dec on rows 1 and 7.
On the second question, call the next row, row 1 and dec on rows 1,3,5 and 7.