The University of Sussex, in the UK, has guidelines on how to punctuate titles
The title of a complete work is usually centred near the top of the first page; if possible, it should be printed either in large letters or in boldface, or even in both. It should not be italicized or placed in quotation marks, and it should not have a full stop at the end. Any punctuation or italics which are required for independent reasons should be used normally; this includes a question mark at the end if the title is a question. If there is a subtitle, a colon should be placed at the end of the title proper; unless the title and the subtitle are both very short, it is best to use two lines.
Full Stops in Titles, Headings and Captions
As a general rule, a full stop is not used at the end of a displayed title, heading, subheading or caption in scholarly English prose. […] However, there are several instances in which full stops are required, as outlined below.
• Full stops should be used whenever the relevant guidelines indicate that full stops (also called full points and periods) should [be used to] close titles, headings and captions, wherever they may appear within a document. It is therefore imperative to consult author instructions and pay careful attention to any details about headings and their formats.
Here is one very good reason why full stops (periods) are normally avoided in titles,
Full stops, like their name suggests, are something that halts the eye of your reader.
This isn’t something you want at this point in your post. Titles are all about leading your reader into your post and so anyway that you can help this flow is a bonus.