Trying to learn about PL/SQL

Question

Have a problem I can not figure out in time. Anyone have any ideas?
Write a PL/SQL program to compute the number of days in each month for year 2020. Your program will first create a table named Month_Days with two columns (see the table structure below). Use a Loop in your program to insert month and the number of days in that month into the table. INSERT INTO command can only be used once in your program. Your program should work correctly for any year.
current version I am working on looks like this
Set Serveroutput on;
DROP TABLE MONTH_DAYS;
CREATE TABLE MONTH_DAYS(
Month_ Varchar(9),
     Days_ Number (2));
Begin
FOR i IN 1..12 LOOP
INSERT INTO MONTH_DAYS (Month_, Days_)
Values(to_char(to_date('i-01-2020','MM')), to_char(to_date(last_day('01-i-2020'),'DD')));
DBMS_OUTPUT.PUT_LINE('Month_'||''|| 'Days_');
end loop;
end;

Answer 1

Compute Number of days in each month of Year 2020
DROP TABLE MONTH_DAYS;
CREATE TABLE MONTH_DAYS(cnt number(2), Month_ Varchar(9),Days_ Number(2));
declare
mons Varchar2(10);
dats Varchar2(10);
begin
for i in 0..11 loop
insert into month_days(cnt, month_, days_)
values
(i,to_char(add_months(to_date('20200101','YYYYDDMM'),i),'Month'),
to_char(last_day(add_months(to_date('20200101','YYYYDDMM'),i)),'DD'));
select month_ , days_ into mons, dats from month_days where cnt = i;
DBMS_OUTPUT.PUT_LINE('Month: '||Mons||'Days: '|| Dats);
end loop;
end;
/