It's important that Google bot should have to crawl and store the information of your site’s web pages which leads to sites being shown in search results. Here, I have shared some techniques to get your site indexed on Google instantly.
1. Google Webmaster Tool
Create an account in webmaster tool and interconnect with your website which is the prior and most important step. After submitting your website on that, you can check the crawl status as shown in the following image.
2. Fetch as Google
If you want to crawl the new pages of your website immediately, you can use this option. In webmaster account choose Fetch as Google and paste the URL you wanna crawl then click Fetch. You can submit up to 500 URL requests per week.
3. XML sitemap
Sitemaps are guides search bots to map your website's inner pages. Generate XML sitemap for your website and submit it in Google via your webmaster account.
Submit your website on Dmoz.org. Because Google also uses data obtained from DMOZ web directory. the site will get get crawl based on your site's content. Many directories are available simialr to Dmoz such as JoeAnt, Gimpsy, GoGuides, and Zeal.
Beyond these, having good internal link structure, good navigation, fresh content, lower load time will also help you to get your site indexed as soon as possible.