Eg. he said,"you are my best friend."

so to convert to indirect speech, you have to make it past tense and also you have to add.."that"

the answer is - he said that i was his best friend
there are no such laws which you can by heart
but if you want help then you message me personally
ill help you definitely
dont worry
Reported speech is usually talked about the past incident, So normally we just change the tense to covert it to reported speech. We use reporting verbs to convert like 'say', 'tell', 'ask'. And we use that to introduce the reported speech. Remember inverted comas are not used after converting. 

Speech : She said, "I saw him".

Reported Speech : She said that she had seen him.
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