Many people, including me, may like telling prospective employers that we can learn when we lack some of the skills that are necessary for the job we're interviewing for. However, most of us may not realize that this is fatal when you say that you can learn.
People say, "I will learn even if I don't know anything" or " I will learn x skill" when the interviewer asks you whether you know x. When you say you will learn, you may want to express that you are modest, or you see yourself as a beginner at the job; however, the boss may have a different perspective. They will see you as trouble when you do not finish their task.
The best way to get involved in the job is to learn more before you start your job. In my previous interviews, I've sometimes gotten stuck when the employer asked whether I know how to do webpage design or programming since computers are not my strength. I also think that if I was placed in an IT related department, it would extremely difficult and I would quickly be kicked out.
During the job, it is not the right time to learn the hard skills step by step. If you would like to keep learning, try focusing on the soft skills. For example, it is feasible to focus on teamwork, the procedures in the company, the organization, or other fellows' interest. These skills can be improved. On the contrary, the hard skills are hard to improve. Because you're being paid, the boss would prefer to not hire someone who is admittedly still learning.
Many people will also explain their work capability or determination after they find they lack the essential skills the employers ask for. And they might think the employer will admire and hire them. However, even they are being hired, it is still very difficult to follow up the normal work, due to a few training sessions and the unfamiliar environment.
If a person is able to adapt to the new environment quickly and positively ask their fellows how to deal with problems, he/she will be possibly successful, compared to those who do nothing in the office and wait for others to teach them every day.