Your career in industry will grow more when you......
Use a dictionary, to "look up" the words you write in English, before you send a message. "Carrier" may sound almost like "career", but it has a very different meaning!
End sentence with ".", put a " ", then begin next sentence with capital letter...........[. How NOT .how]. Put " " after "," etc.
Use "where", "when" and "why", for example, "Where, when and why are PLC used in industry?".
Read, check and edit your message [from the viewpoint of a complete stranger, who has never had a message from you before, like us on CR4] before you press the "send" button.
Doing that will convince your employer you will do the work, rather than him having extra work to decrypt your mobile phone "text" language.
After doing a PLC course, it would be best to design a complete PLC application for a customer, under the supervision of an experienced engineer. But, usually, you will have to modify something existing - and will find out how clearly the original designer documented "how it works", often!
But, be warned, if you cannot document the application and programme, so that engineer, or a complete stranger can understand it, ten years from now (without your help) then you may soon be relocated.