1) the letter ( ل ) is used to justify the cause.
it has the same meaning ( من أجل , بسب )
2) the letter ( ه ) is used to attract the attention of a person to a subject.
3) هذه is a demonstrative adjective like this, that ...
4)masculine singular: ذا+ه=هذا
singular fiminin: ذه+ه=هذه or ذي+ه=هذي
two male : ذان+ه=هذان
two people fimininتان+ه=هاتان
plural:أولاء+ه=هؤلاء
for this reason: لهذه الاسباب/ لهذي الأسباب
5) ف= الفاء السببية expresses the result of causes that are written in the previous sentence.