Optimizing a website for free is possible. However, you need to take your time to get familiar with free tools for optimizing websites. Let's take a look at the most valuable tools that help to manage and keep your website in good condition.
Google Trends
https://trends.google.com/trends/
Google service providing information on the quantity, origin, time dependencies and main regions of queries directed to Google search. Explore trending search topics with Google. Perform your keywords using comparing trends by search terms, regional trends, forecast.
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Google Adwords Keyword Planner
AdWords Keyword Planner helps you create campaigns by suggesting relevant keywords. Explore and compare new keywords for your website. The tool is a useful resource for building strong keyword lists and helping to get your PPC campaign off to a running start.
Robots.txt Tester
https://www.google.com/webmasters/tools/robots-testing-tool
The robot tool analysis robots.txt file of your website ensuring Google and other search engines are crawling and indexing your site properly. Here you may check which URLs are blocked, which statement is blocking it and for which user agent.
Structured Data Testing Tool
https://search.google.com/structured-data/testing-tool/
Use this website to check that Google can parse your structured data markup and correctly display it in search results.By doing so, you will avoid positioning errors. With the truthfully implemented website, it is easier for you to find in the search engine
Validate AMP for Google Search
https://search.google.com/test/amp
AMP pages are usually separated from desktop and mobile pages due to the fact that Google shows AMP pages on SERP (search engine results page) for mobile devices only.
Joomla AMP pages - benefits and support for Joomla.
Mobile Friendly Test Tool
https://search.google.com/test/mobile-friendly
Use Google Mobile FriendlyTool if you want to check, how your website looks on others devices. The responsive website will help you get higher search results and also the satisfaction of your users
Page Speed Tool
https://developers.google.com/speed/pagespeed/insights/
Use this website to find the best solution to make your website fast on all devices. In summary view, you will see not only results but also ready solutions.
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Search Console
https://www.google.com/webmasters/tools/
Use this to monitor Google Search results data for your properties. Is a free service offered by Google that helps you monitor and maintain your site's presence in Google Search results.
Google Analytics
It’s a free and enterprise analytics tools to measure website, app, digital and offline data. Google Analytics helps you analyze visitor traffic.
HTML/XHTML Validator
W3C validator allows you to check the compatibility of an HTML document with HTML or XHTML standards and allows the authors of the website to find errors. Make sure that your website is properly available on every device.
CSS Validator
https://jigsaw.w3.org/css-validator/
This is an Online Validator to validate your CSS. Check correctness of your website CSS ( Cascading Style Sheets) and(X)HTML documents with style sheets.