Parents can use EYFS as guidance.
I think most parents find it comes naturally, responding to their child's interests and the toys they find in shops. Otherwise google is your friend!
Here has some nice gentle guidance without jargon explaining play. here has fantastic craft activities. this site has good ideas for babies...and these are just a few that I have bookmarked!
Some other nice ideas are a treasure basket filled with natural objects or things from around the home such as a wooden spoon, a plastic beaker, some scraps of material etc that a child can explore, messy play with cornflour and water, plain water, bubbles or playdough.
If you're 'serious' about learning about play this book is very good and I use it as a childcare professional.
If you look through this site then there are also play ideas.
There's no one set place to find out about play but if you're concerned then there's information out there. Having said that, the best resource for your baby is you: talking, singing, helping them move.
Is there anything in particular you wanted to know about or was it more of a general enquiry? For example if you wanted to know how to encourage your baby to crawl you could post a question here and a bunch of people would be happy to give you the benefit of their experience! My top tip for that would be placing a toy just out of reach and encouraging the baby to reach for it but other people will have different views.
I hope that helps a bit.