I have recently mashallah started praying five times a day and I have the full intention of doing so, however I can't help but feel I keep making mistakes.

I'm not sure how to explain this


but see
Allahuakbar
Ash-hadu an-La illaha ill Allahu
Assalamu alaikum wa rahmatullah

when is it that with the bold parts you prenounce it "lah" and not "law"



Sorry for my ignorance

and Thanks in advance for answering my question