# Bookmarks for March 8th through April 6th

These are my links for March 8th through April 6th:

- [Perfect responsive images: HTML5 <picture> and Bootstrap 4](http://inspire.blufra.me/html5-element-and-bootstrap-4-media-queries/) –
- [How Good Are Your HTML and CSS Comments?](http://www.sitepoint.com/how-good-are-your-html-and-css-comments/?utm_source=html5weekly&utm_medium=email) –
- [18 Tips for Website Performance Optimization](https://www.keycdn.com/blog/website-performance-optimization/?imm_mid=0e24af&cmp=em-webops-na-na-newsltr_20160401) –
- [Smaller Pictures](https://smaller-pictures.appspot.com/) –
- [Colovely](http://colovely.nofach.com/) –
- <https://www.free-invoice-generator.com/?ref=producthunt> –
- [https://www.producthunt.com/@hnshah/collections/free-stuff-for-startups?utm\_source=Product+Hunt&amp;utm\_campaign=80c8541df8-Memories\_with\_friends3\_17\_2016&amp;utm\_medium=email&amp;utm\_term=0\_2cd7d34185-80c8541df8-123076217](https://www.producthunt.com/@hnshah/collections/free-stuff-for-startups?utm_source=Product+Hunt&utm_campaign=80c8541df8-Memories_with_friends3_17_2016&utm_medium=email&utm_term=0_2cd7d34185-80c8541df8-123076217) –
- [Key Requirements for an IoT Data Platform | MapR](https://www.mapr.com/blog/key-requirements-iot-data-platform#.VgAoAHgwfF8) –
- [Top 49 Tools For The Internet of Things | ProfitBricks Blog](https://blog.profitbricks.com/top-49-tools-internet-of-things/) –
- [Get HTTPS for free!](https://gethttpsforfree.com/) –