Can someone explain this code step by step and the functions which ae used in it?

%%step 5
se = strel('disk',3);           %%create a disk-shaped structring element
bothat = imsubtract(imadd(sharpen,imtophat(sharpen,se)),imbothat(sharpen,se));  %%applying bottom hat method
figure
imshow(bothat);
title('Bottom Hat Method');

[Stephen23]

@ Jainee Solanki: The MATLAB documentation is easy to read and you can search it using your favorite internet search engine. That would be a good start.

https://www.mathworks.com/matlabcentral/answers/228557-experts-of-matlab-how-did-you-learn-any-advice-for-beginner-intermediate-users