Delete rows based on match criteria in two excel files or single Excel File

[DocAElstein]

Problem 1)

Problem 1)
Do u mean to say that
I have to use this in this macro

Let Lr1 = Ws1.Range("A" & Ws1.Rows.Count & "").End(xlUp).Row
Let Lr2 = Ws2.Range("A" & Ws2.Rows.Count & "").End(xlUp).Row

..

Yes

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Problem 2)
This is not a VBA problem.
You cant speak English or understand any simple thing in English.
I am not sure what the solution to such problems are.
Possibly try to leave in some 'green comments so then later you will remember what code line is doing. Then later it is easier to remember and later it is easier to see where is problem
'green comments do not cause any problems
'green comments do not make any coding slower
There will never be issues caused by 'green comments
'green comments can stay for ever. They do no harm
VBA does not see 'green comments. So VBA is not effected by 'green comments For VBA , 'green comments are invisible. So 'green comments cannot have any effect on any coding
There will never be any problems caused by 'green comments
There can never be any problems caused by 'green comments
A code line can be very long. So you can have a very long ling full of important information so that later you can see what all code line are doing.
So if you have lots of 'green comments you will not need to remember, because all information is there for you to read later if you need to know again what is the code doing.

But everyone has a different choice. You can choose

Some people use no 'green comments
Some people use some 'green comments
Some people use lots of 'green comments
I use very many 'green comments because I am not smart. I am stupid. I forget everything. I am not a computer programmer professional. I am a stupid Builder. I always forget what my macros do. So I choose to write lots of 'green comments. Then later his helps me to remember what I did and what to do again in the future