I did not understand update bit concept

#1

will u please elbaorta it am unable to understand this

#2

these are the steps for updating a bit

p is postion at which bit is to be updated with b

We first create a mask that has set bit only
at given position using bit wise shift.
mask = 1 << position

Then to change value of bit to b, we first
make it 0 using below operation
value & ~mask

After changing it 0, we change it to b by
doing or of above expression with following
(b << p) & mask, i.e., we return
(n & ~mask) | (b << p)

from these steps first two are to cleared a bit and 3rd one is to set the bit with b

i hope this helps
if not you can ask again

i recommend you to watch video again at it is explained there clearly