Question

best lines to start an informal letter in english

Answer 1

You can use following-

●Hello, it's been a long time since I have written a letter to you

●Hi, my dear friend hope you are having a joyous time

●I thought of dropping a line and was thinking about you lately

Answer 2

For parents: my beloved parents hope you are very well.
For friend: hello friend (dood) my hopeless buddy hope u r very well
hope this ans is helpful to u