Google has a LONG list of technical requirements it advises you meet, on top of all the things it tells you NOT to do to optimise your website. Meeting Google’s technical guidelines is no magic bullet to success – but failing to meet them can impact your rankings in the long run – and the odd technical issue can actually severely impact your entire site if rolled out across multiple pages.
There are some basic keyword usage rules you should follow to get started. Unique keywords should be employed on each page of your site in the areas that bots and humans normally look to reassure them that you have what they're after. This includes both the title tag and the body of your content, which leads to an important point: the pitfalls of clickbait. You may believe you're enticing more clicks by offering tantalizingly vague titles for your content, but by disguising what the page is actually about, you're opting out of some of the power of keywords.