today I'm going to show you how you can create some space in between the header and the post so i recommend you use a new blog until you understand how this works then you could apply it to your current blog as I'm not responsible if you mess your template up now it depends what template you have but most of them already have this bit of code so you will need to make sure you have the following code

if you cant find it on your template don't worry just add it after the header like i have done above and make sure you add a closing div tag at the bottom like below

now you need to look for the following CSS code again it depends what template you have if you cant find it you will need to add it but without the padding:0 16px; value

once you have found it or added it you need to add the highlighted code to the content-wrapper you just found or added and you can change the 50px value to whatever you want it depends how much space you want between the blogs header and the post

once done preview your template before saving to see the space you just created then save or change the 50px value if you need more or less space